给水站 water supply station

Lubrication for the main reduction gears used with diesel engines is usually supplied by

A.oil from the main engine sump

B.an independent lube oil system

C.the stern bearing head tank

D.the stem bearing sump tank

If the salinity(含盐量) of ocean waters is analyzed, it is found to vary only slightly from place to place.Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation--conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salts staybehind. If this is carried to the extreme, of course, white crystals of salt would be left behind.

The opposite of evaporation is precipitation(降水), such as rain, by which water is added to the ocean. Here the ocean is being diluted(稀释) so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff(形成地表水部分的降水).

Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions whererivers dilute the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

In the Weddell Sea, off Antarctica, the densest water in the oceans is formed as a result of this freezingprocess, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.

Choose correct answers to the question: The best title of the passage can be “_____”.

A.Typical Oceans and Their Respective Features

B.The Causes of the Changes in Salinity of Ocean Water

C.Different Oceans Have Different Salinity

D.The Precipitation and Evaporation of Oceans

Which of the following processes will increase salinity of ocean waters?A.Evaporation.

B.Precipitation.

C.Melting.

D.Dilution.

According to this passage, the sea _ is likely to have the lowest salinity.A.in tropical areas

B.off Antarctica

C.of high rainfall

D.with abundant

The Weddell Sea _____.

A.is a good example of increased salinity in freezing sea water

B.is much larger in area than the Arctic oceans

C.has a much lower salinity now than ever

D.has the denser water in its upper parts

Coastal regions are mentioned as cases where _____.A.sea water is less salty because fresh water joins in

B.rivers carry industrial exhaust into sea

C.sea ice tends to melt more quickly than in the center of oceans

D.heavy water sinks to the deeper portions of the oceans

请帮忙给出每个问题的正确答案和分析，谢谢！

If the salinity(含盐量) of ocean waters is analyzed, it is round to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation—conversion of liquid water to water vapor. In this manner, the salinity is increased, since the sales stay behind. If this is carried to the extreme, of course, white crystals of salt would be left behind; this, by the way, is how much of the table salt we use is actually obtained.

The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.

Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

In the Weddell Sea, off Antarctica, the densest water in the oceans is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.

What does the passage mainly discuss?

A．The elements of salt.

B．The bodies of water of the world.

C．The many forms of ocean life.

D．The salinity of ocean water.

Freshwater life itself has never come easy in the Middle East. Ever since The Old Testament (旧约全书), God punished man with 40 days and 40 nights of rain. Water supplies here have been dwindling. The rainfall only comes in winter and drains quickly through the semiarid land, leaving the soil to bake and to thirst for next November.

The region's accelerating population, expanding agriculture, industrialization, and higher living standards demand more freshwater. Drought and pollution limit its availability. War and mismanagement waste it. Said Joyce Start of the Global Water Summit Initiative, based in Washington, D.C. "Nations like Israel and Jordan are swiftly sliding into that zone where they are suing all the water resources available to them. They have only 15 to 20 years left before their agriculture, and ultimately their food security, is threatened."

I came here to examine this crisis in the making, to investigate fears that "water wars" are imminent, that water has replaced oil as the region's most contentious commodity. For more than two months I traveled through three river valleys and seven nations--from southern Turkey down the Euphrates River to Syria, Iraq, end on to Kuwait; to Israel end Jordan, neighbors across the valley of the Jordan; to the timeless Egyptian Nile.

Even amid the scarcity there are haves and have-nots. Compared with the United States, which in 1990 had freshwater potential of 10,000 cubic meters (2.6 million gallons) a year for each citizen, Iraq had 5,500, Turkey had 4,000, and Syria had more than 2,800. Egypt's potential was only 1,100. Israel had 460. Jordan had a meager 260. But these are not firm figures, because upstream use of river water can dramatically alter the potential downstream.

Scarcity is only one element of the crisis. Inefficiency is another, as is the reluctance of some water-poor nations to change priorities from agriculture to less water-intensive enterprises. Some experts suggest that if nations would share both water technology end resources, they could satisfy the region's population, currently 159 million. But in this patchwork of ethnic and religions rivalries, water seldom stands alone as an issue. It is entangled in the politics that keep people from frosting and seeking help from one another. Here, where water, like truth, is precious, each nation tends to find its own water end supply its own truth.

As Israeli hydrology professor Uri Shamir told me: "If there is political will for peace, water will not be a hindrance. If you want reasons to fight, water will not be a hindrance. If you want reasons to fight, water will give you ample opportunities."

Why does the author use the phrase "for next November" (Line 3, Para. 1)?

A．According to the Old Testament freshwater is available only in November.

B．Rainfall comes only in winter starting from November.

C．Running water systems will not be ready until next November.

D．It is a custom in that region that irrigation to crops is done only in November.

听力原文：F OK, Clive, now you've said that at this stage in our consultation process you want to talk about promoting the business ...

M Yes.

F And I would say the place to start is establishing what it is you mean by 'the business'.

M Uh-huh.

F So the first step is to carry out an appraisal,

M Like an analysis?

F Yes, considering all aspects of your operation, strengths and weaknesses, and so on, so you can get clear in your own head what your selling points should, be. The possibilities for what you might focus on are pretty wide. People often tend to have a strong belief in their products, although these days expectations are generally so high that differentiation can be tough to establish on that front. In your case being able to get the goods to customers quickly is likely to have a greater impact and so be something worth drawing attention to - it represents the kind of service that will make the goods easier to sell, and so give you a wider appeal.

M Interesting.

F And you should also think ahead a bit, and specify what you're looking to achieve through greater publicity.

M Right. I've been thinking in terms of improving the customer base. Bike accessories is a surprisingly competitive area but I'm satisfied that we're positioned reasonably well - although I would like to be selling in higher volumes, getting more bulk orders through chains. I've got some very capable staff who'd welcome the challenge of testing their skills in handling bigger deals.

F And further into the future?

M I think basically bringing in product improvements. Obviously, cycling as a sport plays a key role in the market - people expect ever better equipment, and I need to be upgrading what I produce all the time, so that eventually the whole range is what I'd currently term 'best'. That all makes sense. Now, you referred to the idea of newspaper advertising in our meeting last week

M As one way to go.

F It's a popular form. of advertising, of course, but not without its pitfalls - although I certainly wouldn't want to ignore its many advantages. Bear in mind that most people do not read a paper from cover to cover nor for any length of time. They flick through and dip into it for about ten or twenty minutes and may therefore miss your advertisement. A significant proportion of them won't be interested in your message anyway, however brilliantly you design it. And of course papers have very skilled design departments who'll do their best to give you a striking layout. Papers tend not to be kept for very long - people leave them behind on trains and in cafes. You can seek to compensate for this by publishing repeats and variations as often as you wish, of course, but you could find you're chasing ever lower returns.

M I'd also wondered about guidebooks. I thought they could be a safe bet, despite having a fairly law circulation. I've noticed a fair number of ads in this year's edition of the tourist guide far the region, for example, and I feel that it's a type of publication that people tend to leave lying around for others to read, or borrow, so the exposure could be quite effective throughout the year

F Good point. Moving onto direct mail ...

M Now I've been having some doubts there, Rose.

F Oh?

M Yeah, I mean, in terms of resources. I understand that it can impact quite welt, although the percentage rates I hear quoted don't strike me as particularly impressive. But assembling the whole thing seems pretty labour-intensive. There's so much else to be getting on with, without trying to plough your way through some endless list of potential consumers, most of whom may not be interested anyway,

F Well, that's certainly something to take into account, but I'd still recommend you to seriously consider doing a mailshot.

M I'm not ruling it out.

F And if you do, make sure you take an effective approach, because that envelope and its contents will be saying a lot about you. Your letter could be

A．the scope of his after-sales service.

B．the speed of his delivery system.

C．the quality of his product range.

The crank chamber oil _____.

A.can be recovered

B.is only supplied to cylinders

C.only feeds the main bearing

D.is a kind of detergent

In this passage, the writer is clearly stating the intention which is to get the reader to ______.

A．confirm current education trends and teaching methods

B．rethink and reorganize educational strategies

C．think about the various elements which constitute what we call "communication" nowadays

D．reassure the parents about the methodology currently being used in American schools

In this passage, the writer is clearly stating the intention which is to get the reader to ______.

A．confirm current education trends and teaching methods

B．rethink and reorganize educational strategies

C．think about the various elements which constitute what we call "communication" nowadays

D．reassure the parents about the methodology currently being used in American schools

In this passage, the writer is clearly stating the intention which is to get the reader to

A．confirm current education trends and teaching methods

B．rethink and reorganize educational strategies

C．think about the various elements which constitute what we call 'communication' nowadays

D．reassure the parents about the methodology currently being used in American schools