Almost three-quarters of those who were (polled) said they opposed the government's policy().

A.three-forth

B.three-quarter

C.three-quarters

D.three-forths

he system except？

A．Giving witnesses a selection of face shapes to choose from before facial features are added.

B．Generating facial features after several rounds of selections.

C．Combining the images generated by different witnesses or even from a single witness.

D．Generating three-quarter angle views of the face.

specially in the temperate zones, is very much【B2】______by the oceans around them. The areas【B3】______the sea have a "【B4】______climate", with rather cool summers and warm winters. The interiors, far from the sea, have a climate with extremely hot summers and cold winters. Rain comes from the evaporation of rivers, seas and lakes.【B5】______after heavy rain, the pavements in a city do not take【B6】______to dry because the rainwater evaporates into the air. On a warm dry day it e-vaporates very rapidly, as warm air can absorb more【B7】______than cold air.【B8】______at any particular temperature, the atmosphere can hold only a certain【B9】______amount of water vapor. The air is then saturated,【B10】______a sponge that cannot hold any more water. The lower the temperature, the【B11】______water vapour is required to saturate the air. All over the surface of the Earth, millions of tons of water are evaporating every second,【B12】______in the air into drops so small that it【B13】______thousands of them to make a single raindrop. It is these【B14】______droplets that make clouds. When clouds roll in from the sea over the warmer land, they are forced to【B15】______and become cooler in the colder upper atmosphere. As the air【B16】______it may pass through its【B17】______point and then some of its water vapor turns to rain. Day in, day out, the【B18】______water circulates between the air and the land: rivers evaporate to make clouds, clouds make rain, rain makes rivers which【B19】______run into the sea. This is called the rain【B20】______.

【B1】

A．temperature

B．shape

C．feature

D．climate

WATER

The second most important constituent of the biosphere is

liquid water. This can only exist in a very narrow range of tem-

peratures, since water freezes at 0℃ and boils at 100℃. This is

only a tiny range compared with the low temperatures of some

other planets and the hot interior of the earth, let the tempera- 【M1】______

ture of the sun.

As we know, life would only be possible on the face of a 【M2】______

planet had temperatures somewhere within this range. 【M3】______

The earth's supply of water probably remains quite fairly con- 【M4】______

stant in quantity. A certain number of hydrogen atoms, which

are one of the main constituents of water, are lost by escaping

from the atmosphere to out space, but they are probably just 【M5】______

about replaced by new water rising away from the depths of the 【M6】______

earth during volcanic action. The total quantity of water is not

known, and it is about enough to cover the surface of the globe 【M7】______

to a depth of about two and three-quarter ms. Most of it - 97%

is in the form. of the salt waters of the oceans. The rest is

fresh, but three quarter of this is in the form. of ice at the Poles 【M8】______

and on mountains, and cannot be used by living systems when 【M9】______

melted. Of the remaining fraction, which is somewhat fewer 【M10】______

than 1% of the whole, there is 10 20 times as much stored as un-

derground water as is actually on the surface. There is also a mi-

nor, but extremely important, fraction of the water supply

which is present as water vapour in the atmosphere.

【M1】

Water

The second most important constituent(构成成份) of the biosphere(生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.

The earth's supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form. of the salt water of the oceans—about 97 per cent. The rest is fresh, but three-quarters of this is in the form. of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fraction, which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as there is actually on the surface. There is also a tiny, but extremely important fractions of the water supply which is present as water vapour in the atmosphere.

Water vapour in the atmosphere is the channel through which the whole water circulation(循环) of the biosphere has to pass. Water evaporated(蒸发) from the surface of the oceans, from lakes and rivers and from moist(潮湿的) earth is added to it. From it the water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance is restored by the runoff from the land in the form. of rivers.

Liquid water only exists______.

A．in the center of the earth.

B．on the surface of our planet.

C．in a very narrow range of temperatures.

D．in the costal areas of the earth.

Water

The second most important constituent(构成成份) of the biosphere(生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.

The earth's supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form. of the salt water of the oceans—about 97 per cent. The rest is fresh, but three-quarters of this is in the form. of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fraction, which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as there is actually on the surface. There is also a tiny, but extremely Important fraction of the water supply which is present as water vapour in the atmosphere.

Water vapour in the atmosphere is the channel through which the whole water circulation(循环) of the biosphere has to pass. Water evaporated(蒸发) from the surface of the oceans, from lakes and rivers and from moist(潮湿的) earth is added to it. From it the water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance is restored by the runoff from the land in the form. of rivers.

Liquid water only exists______

A．in the center of the earth.

B．on the surface of our planet.

C．in a very narrow range of temperatures.

D．in the costal areas of the earth.

第三篇

Water

The second most important constituent (构成成份) of the biosphere (生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.

The earth's supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form. of the salt water of the oceans - about 97 per cent. The rest is fresh, but three-quarters of this is in the form. of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fractional which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as there is actually on the surface. There is also a tiny, but extremely important fraction of the water supply which is present as water vapor in the atmosphere.

Water vapor in the atmosphere is the channel through which the whole water

circulation (循环) of the biosphere has to pass. Water evaporated (蒸发) from the surface of the oceans, from lakes and rivers and from moist (潮湿的) earth is added to it. From it the water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance is restored by the runoff from the land in the form. of rivers.

41 Liquid water only exists

A in the center of the earth.

B on the surface of our planet.

C in a very narrow range of temperatures

D in the coastal areas of the earth.

Water

The second most important constituent(构成成份) of the biosphere(生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.

The earth's supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form. of the salt water of the oceans—about 97 per cent. The rest is fresh, but three-quarters of this is in the form. of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fraction, which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as there is actually on the surface. There is also a tiny, but extremely Important fraction of the water supply which is present as water vapour in the atmosphere.

Water vapour in the atmosphere is the channel through which the whole water circulation(循环) of the biosphere has to pass. Water evaporated(蒸发) from the surface of the oceans, from lakes and rivers and from moist(潮湿的) earth is added to it. From it the water comes out again as rain or snow, falling on either the sea or the land. There is, as might be expected, a more intensive evaporation per unit area over the sea and oceans than over the land, but there is more rainfall over the land than over the oceans, and the balance is restored by the runoff from the land in the form. of rivers.

Liquid water only exists______

A．in the center of the earth.

B．on the surface of our planet.

C．in a very narrow range of temperatures.

D．in the costal areas of the earth.

A、as good almost as

B、as almost good as

C、almost as good as

D、almost as good than

A.几乎

B.全部

C.少数