Many animals are used to help scientists find cures for diseases. One of the most common animals used is monkeys, or primates. T

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问题     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 hidden so that a person could slice open a finger while opening the letter. The police say they will try to protect the researchers from the increasing violence done by activists.

选项 A、Set them free.
B、Damage the labs.
C、Sent threatening letters.
D、All of the above.

答案D

解析 见原文最后两段。保护动物活动者使用暴力手段阻止人类对动物做试验。
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