[单项选择]The physical shape and coloring of many animals are the result of gradual （） to particular circumstances.
A. modification
B. variation
C. application
D. adaptation

[单项选择]Being able to move gives animals many advantages, but it also generates its own demands. For any animal, ______ movement can be unhelpful or even dangerous.
A. ransom
B. retrieve
C. random
D. redeem

[单项选择]

Passage One
Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, for example, have poor eyesight and no color vision. They see only shades of gray. But the dog’s sense of smell is extraordinary,
The kind of dog known as Alsatian has 220 million olfactory (嗅觉) cells. Man has five million. Scientists believe that the Alsatian is one million times better than man in finding out odors.
The human sense of smell, however, is really quite good. The average human being can distinguish more than 10 000 different odors.

The best title of the passage is " （）".
A. The Human Sense of Smell
B. Dogs Have Poor Eyesight
C. Sense of Smell
D. Dogs Have Excellent Sense of Smell

[单项选择]Why do many scientists think animals are basically sleepwalkers


A. Because animals learn to carry out complex actions.
B. Because animals are trained to carry out complex actions.
C. Because animals carry out complex actions in response to stimuli.
D. Because animals carry out complex actions without awareness.

[单项选择]

Passage Five
Many animals are used to help scientists find cures for diseases. One of the most common animals used is monkeys, or primates. There are groups of people who want to stop the research on animals. They are called animal rights activists.
The scientists say their research could help save the lives of many men, women and children. They try to cure diseases like cancer and AIDS.
The animal rights activists say the animals suffer. They take baby monkeys away from their mothers, and sometimes holes are drilled in their heads. The activists have tried to stop the research for the past 10 years. They let animals go free or damage the labs.
The University of California at Davis has 3,800 rhesus macaque monkeys. It is one of the largest primate research labs. The activists sent letters to researchers at Davis and about eighty other researchers around the country, whose names were on the web pages. The warning letters had razor blades hidd
A. increasing
B. decreasing
C. ending
D. staying about the same

[单项选择]How many animals have been found neglected by inspectors in the last 12 months


A. Over 1,000,000.
B. More than 70,000.
C. Nearly 20,000.
D. Close to 3000.