Most animals have little connection with animals of different kind, unless they hunt t

species of plant and several hundreds thousands types of living things. But only a tiny percentage of these were ever domesticated. Modern shops have hastened a trend towards specialization which began in the earliest days of agriculture. The food of the rich countries has become cheaper relative to wages. It is speedily distributed in supermarkets. But the choice annually becomes less and less great. Even individual foods themselves become more standardized. We live in the world of carrot specially blunted in order to avoid making a hole in the bag, and the tomato grown to meet a demand for a standard weight of weighting tomatoes to a kilo. Siri von Reis asks: "Only the three major cereals (谷物类食物) and perhaps ten other widely cultivated species stand between famine and survival for the world's human population and a handful of drug plants has served Western civilization for several thousand years. A rather obvious question arises: Are we missing something?" After all, there are 800 000 species of plant on earth.

1、In prehistoric times people____.

A、ate much more than we do today

B、lived mainly on plant food

C、had a wide-ranging diet

D、were more fussy about what they ate

2、Most of us have come to expect____.

A、no variation in our diet

B、a reduction in food supplies

C、a specialist diet

D、food conforming to a set standard

3、The specialization of food was started by____.

A、the emergence of supermarkets

B、the rise of agriculture

C、the rich countries

D、the modern shops

4、According to the passage, people in the West today survive on____.

A、carrots and tomatoes

B、several thousand types of plants and cereals

C、a very small number of cultivated foods

D、special species planted one thousand years ago

5、The conclusion seems to be that we____.

A、could make use of more natural species

B、don't cultivate the right kind of food

C、produce more food than we need

D、cultivate too many different species

Under normal conditions, the act of communication requires the presence of at least two persons: one who sends and one who receives the communication. In order to communicate thoughts and feelings, there must be a conventional system of signs or symbols that mean the same to the sender and the receiver.

The means of communication are too numerous and varied for systematic classification; therefore, the analysis must begin with the means of receiving communication. Reception of communication is achieved by our senses. Sight, hearing, and touching seem to play the most important roles. Smell and taste play very limited roles, for they cannot receive intellectual expression from fully developed systems of sings and symbols.

Examples of visual communication are gesture and imitation. Although both frequently accompany speech, there are systems that rely solely on sight, such as those used by deaf, and dumb persons. Another means of communicating visually is by signals of fire, smoke, flags, or flashing light. Feelings may be simply communicated by touch, such as by handshaking or backslapping, although a highly developed system of hand-stroking has enabled blind, deaf, and dumb persons to communicate intelligently. Whistling to someone, applauding in a theater, and other forms of communication by sound rely upon the ear as a receiver. The most fully developed form. of auditory communication is, of course, the spoken language.

The means of communication mentioned so far have two features in common: they last only a short time, and the persons involved must be relatively close to each other. Therefore, all are restricted in time and space.

1、Reception of communication______ .

A、is more important than sending messages

B、 depends on two persons

C、 involves use of the senses

D、 play only limited roles

2、Applauding is specifically mentioned as an example of ______.

A、communication by sound

B、 gesture and imitation

C、 communication by sending a message

D、 communication between the listener and speaker

3、Persons who cannot see, hear, or speak are able to communicate through ______.

A、gesturing

B、handshaking

C、smelling

D、hand-stroking

4、The author specifically mentions that speech is______

A、often used when other means are impossible

B、necessary for normal communication

C、the only highly developed system of communication

D、the most developed form. of communication based on hearing

5、According to the passage, means of communication _________

A、can develop quickly if there is enough time and space

B、all have the same features

C、have some limitations even if they are fully developed

D、depend on the persons involved

You have been badly injured in a car accident. It is necessary to give you a blood transfusion because you lost a great deal of blood in the accident. However, special care must be taken in selecting new blood for you. If the blood is too different from your own, the transfusion could kill you. There are four basic types of blood: A, B, AB, and O. A simple test can indicate a person's blood type, which, like hair color and height, is inherited from parents. Because of substances contained in each type, the four groups must be transfused carefully. Basically, A and B cannot be mixed. A and B cannot receive AB, but AB may receive A or B. O can give to any other group; hence, it is often called the universal donor. For the opposite reason, AB is sometimes called the universal recipient. However, because so many reactions can occur in transfusions, patients usually receive only salt or plasma (liquid) until their

1、A good title for this passage is ________.

A、Getting Blood and Plasma

B、Special Blood Types

C、Human Blood Types

D、The Blood Bank of a Hospital

2、The word "hence" in line 10 means _________

A、always

B、 often

C、 therefore

D、 seldom

3、In a blood transfusion, it is easiest to find the acceptable type of blood for a person with the blood type of ________

A、A

B、 B

C、 AB

D、 O

4、The purpose of using salt and plasma before a blood transfusion is to allow time ______.

A、to test the reactions to the transfusion

B、for matching the blood to be transfused with the patient's blood

C、 for the blood to be delivered from the blood bank

D、 to select a new type of blood for the patient

5、Most Europeans have blood type _________

A、A

B、B

C、O

D、A or O