Of all the animals in the animal kingdom, which one (aside from man) is the cleverest?

There are several ways of measuring the intelligence of animals. In one test a scientist sets three same cans on a table. While the animal watches, he puts food under one of the cans. Then he leads the animal away. Some time later, he brings it back to see if it remembers which can has the food. No smelling is allowed; the animal must go directly to the correct can or it fails.

This is called a delayed- response text. The idea is to find out how long an animal’s memory can keep information. The scientists would try showing the cans to the animal one hour later, or two hours later, or even a full day later. They discovered that chimpanzees and elephants had the best memory, and were able to remember the correct can for at least twenty hours. No other animal is close. Dogs came next, but they only remembered for nine hours.

To settle the matter, the scientists designed a huge maze (迷宫) and ran the chimps  and elephants through it. The maze was very difficult, with many blind paths and dead ends. It took the chimps (chimpanzees) ten minutes to find their way out. The elephants needed half an hour. Even allowing for the elephants’ slower rate of speed, the test shows that chimpanzees are the cleverest animals.

From this and other tests, the scientists drew the following conclusion: an animal’s intelligence depends on the size of its brain in proportion (比例) to the size of its body. The elephant’s brain weighs ten pounds. But this is only 1/600^th of its 6,000 pounds body. A chimp’s brain weighs about one pound, or 1/120^th of its total body weight. So in proportion to its body size, the chimp has four times as much brain as the elephant----more brain for less body. The chimp is the champ!

1.Which is the best title ?

2.The main idea of this passage is that ________.

3.The delayed-response test is designed to test an animal’s________.

4.The passage tells that elephants ________.

5.According to the passage, a rhinoceros (犀牛) that weighs 2100 pounds, and has a 3-pound brain is

________.

Of all the animals in the animal kingdom, which one (aside from man) is the cleverest?

    There are several ways of measuring the intelligence of animals. In one test a scientist sets three same cans on a table. While the animal watches, he puts food under one of the cans. Then he leads the animal away. Some time later, he brings it back to see if it remembers which can has the food. No smelling is allowed; the animal must go directly to the correct can or it fails.

    This is called a delayed- response text. The idea is to find out how long an animal’s memory can keep information. The scientists would try showing the cans to the animal one hour later, or two hours later, or even a full day later. They discovered that chimpanzees and elephants had the best memory, and were able to remember the correct can for at least twenty hours. No other animal is close. Dogs came next, but they only remembered for nine hours.

    To settle the matter, the scientists designed a huge maze (迷宫) and ran the chimps  and elephants through it. The maze was very difficult, with many blind paths and dead ends. It took the chimps (chimpanzees) ten minutes to find their way out. The elephants needed half an hour. Even allowing for the elephants’ slower rate of speed, the test shows that chimpanzees are the cleverest animals.

    From this and other tests, the scientists drew the following conclusion: an animal’s intelligence depends on the size of its brain in proportion (比例) to the size of its body. The elephant’s brain weighs ten pounds. But this is only 1/600^th of its 6,000 pounds body. A chimp’s brain weighs about one pound, or 1/120^th of its total body weight. So in proportion to its body size, the chimp has four times as much brain as the elephant----more brain for less body. The chimp is the champ!

Which is the best title ?

A. The Elephant’s Memory                                B. The Cleverest Animal

C. Judging Intelligence                                     D. The Chimp’s Brain

The main idea of this passage is that ________.

A. there are several ways of measuring the intelligence of animals

B. chimps and elephants have the best memory          

C. intelligence tests show that the chimp is the cleverest animal                     

D. the scientists designed a huge maze and ran the chimps and elephants through it

The delayed-response test is designed to test an animal’s________.

A. eyesight                   B. intelligence               C. learning ability         D. memory

The passage tells that elephants ________.

A. never forget things                                       B. are more clever than chimps           

C. are slower-moving than chimps                            D. have better memories than chimps

According to the passage, a rhinoceros (犀牛) that weighs 2100 pounds, and has a 3-pound brain is

 ________.

A. as clever as a chimp                                     B. more clever than an elephant          

C. less clever than an elephant                           D. as clever as an elephant

We have seen that pesticides(杀虫剂)now pollute soil, water, and food, and that they have the power to make our rivers fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the opposite, is part of nature. Can he escape a pollution that is now so thoroughly spread throughout our world?

We know that even single exposure(暴露) to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers, and others exposed to enough quantities of pesticides is very sad and should not happen. For the population as a whole, we must pay more attention to the delayed effects of taking in small amounts of the pesticides that unseeably pollute our world.

Responsible(负责的) public health officials have pointed out that the biological effects of chemicals are increasing in amount over long periods of time, and that the danger to man may depend on the amount of the exposures received throughout his lifetime. For these very reasons people easily take no notice of the danger. It is human nature to shake off what may seem to us a future disaster(灾害). "Men are naturally most impressed by diseases which have obvious signs," says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly come near them unnoticed."

Which of the following is closest in meaning to the underlined sentence?

A. Man doesn't care about what happens in nature.

B. Man acts as if he does not belong to nature.

C. Man can avoid the effects of environmental pollution.

D. Man can escape his responsibilities for environmental protection.

People are likely to take no notice of the delayed effects of exposure to chemicals because________.

A. limited exposure to them does little harm to people's health

B. the present is more important to them than the future

C. the danger does not become seen clearly and immediately

D. humans are able to bear small amounts of poisoning

It can be concluded from what Dr. Dubos says that________.

A. people find hidden diseases difficult to deal with

B. attacks by hidden enemies are likely to be deadly

C. diseases with obvious signs are easy to cure

D. people are likely to take no notice of hidden dangers caused by pesticides

We are still at the airport. If it weren’t for the delayed flight, we _____ the concert right now.

   A. must enjoy        B. can be enjoying  

C. would be enjoying        D. should have enjoyed

We're still at the airport. If it weren’t for the delayed flight, we            _____the concert right now.