Animal experimentation is the backbone of American research and treatment of disease1. Each year, 17 million to 22 million animals are sacrificed in the name of science. While 90 percent of them are rats and mice, 180,000 dogs, 50,000 cats, 61,000 monkeys and 554,000 rabbits are done away with in laboratories2 operated by industry and government.
But the public has raised an outcry over these deaths. Spurred vivid reports of cruelty, the animal rights movement is made up of 7,000 organizations with 10 million members. They've documented cases in which monkeys were isolated in steel tanks for 45 days and dogs were bombarded with radiation or chemicals until they bled from the mouth.
Scientists say such incidents are rare. Laws have been passed to govern testing. Many research centers now have committees to review all proposed3 animal experiments, and computers can be used in place of（代替）animals in many experiments. But scientists say they can't do without animals to test new drugs and treatments on animals to make sure they're safe for humans. Animal experiments produced vaccines or treatments for diseases4 such as diabetes, and techniques used in open heart surgery. They're important to efforts to find a treatment for 人工智能DS.
Animal rights activists5 have shown they will go to almost any length. One New York researcher received more than 10,000 protest letters following publicity of her experiments in which she gave drugs to monkeys. The researcher was studying drug addiction. A protester6 was arrested in Connecticut for placing a pipe bomb（铁管土炸药）outside a company that used animals in tests. After fires and break-ins, many labs have bought electronic locks and alarms for protection. Other targets of the animal rights movement are the fur industry, farms, and school biology classes in which children dissect frogs.
The movement has scored some successes. A dozen states no longer allow pounds ── places that accept dogs and cats that have no homes ── to sell animals to scientists. Scientists claim the cosplayt of their work will rise as a result.
The battle between scientists and activists raises a basic question: Can modern society be both humane in its treatment of living things and advanced in its treatment of disease? It seems certain there will be new restrictions placed on the use of animals in scientific experiments.
Choose the correct answer.
1. The main idea of the article is _____.
A. fewer animals should be taken to laboratories
B. Americans are questioning the use of animals in experiments
C. mice and rats make the best subjects for experiments
D. scientific experiments can be carried out without animals
2. Animal experiments will probably continue because _____.
A. scientists insist they are harmless7
B. the groups that oppose them aren't very big or powerful
C. they are critical for understanding and curing human disease
D. there are enough regulations to protect animals from abuse8
3. Proponents9 of animal rights are most convincing when they _____.
A. explode bombs at laboratories that conduct scientific tests
B. point out the diseases that have been cured by scientists
C. threat their own pets kindly10
D. give examples of animals that were mistreated in labs
4. The animal rights movement is _____.
A. not very successful in passing laws to protect animals
B. trying many different approaches to accomplish its goals
C. more interested in protecting dogs than in protecting mice
D. supported mostly by people who dislike scientists
5. Scientists will be satisfied only if _____.
A. they can continue using animals in their experiments
B. the animal rights movement comes to a halt11
C. they install12 locks and alarms on their labs
D. their supply of animals is increased significantly
Keys: BCDBA
