Questions 21 to 25 are based on the following passage.
　　Protests at the use of animals in research have taken a new and fearful character in Britain with the attempted murder of two British scientists by the terrorist technique of the pre-planted car-bomb.考试大－全国最大教育类网站(www．Examda。com)
　　The research community will rightly be alarmed at these developments, which have two objectives: to arouse public attention and to frighten people working in research with animals. The first need is that everything should be done to identify those responsible for the crimes and to put them on trail. The Defence Research Society has taken the practical step of offering a reward of 10,000 pounds for information leading to those responsible, but past experience is not encouraging. People are unlikely to be tempted by such offers. The professional police will similarly be confronted by the usual problem of finding a needle in a haystack.采集者退散
　　That is why the intellectual (知识分子) community in Britain and elsewhere must act more vigorously in its own defence. There are several steps that can be taken, of which the chief one is to demand of all the organizations that exist with the declared objectives of safeguarding the interests of animals that they should declare clearly where they stand on violence towards people. And it will not be enough for the chairmen and chairwomen of these organizations to utter placatory (安抚的) statements on behalf of all their members. These people should also undertake that it will be a test of continuing membership in their organizations that members and would be members should declare that they will take no part in acts of violence against human beings. Even such undertakings would not be fully effective: people, after all, can lie. But at least they would distinguish the organizations entitled to a continuing voice in the dialogue with the research community about the rights of animals in research from the organizations that deserve no say.
　　21. The words “these developments” (Para. 2, Line 1) most probably refer to ________.
　　A) the acts of violence against scientists
　　B) the use of animals in research
　　C) the techniques of planting bombs in cars
　　D) the establishment of new animal protection organization
　　22. Which of the following is TRUE according to the passage?
　　A) The police abandoned their efforts to find the criminals.
　　B) The terrorists escaped with the help of their organizations.
　　C) The attempted murder caused grave anxiety among British scientists.
　　D) People sympathized murder caused grave anxiety among British scientists.
　　23. The author’s purpose in writing his article is to demand that animal-protecting organizations ________.
　　A) declare their objectives clearly
　　B) give up the use of violence
　　C) continue the dialogue with the scientific community
　　D) help to find those responsible for the attempted murder
　　24. In the author’s opinion ________.
　　A) since people can lie, the problem about their rights of scientists can’t be solved
　　B) animal-protecting organizations about be held responsible for acts of violence against scientists
　　C) animal protection organizations should be declared illegal
　　D) the scientists should take effective measures to protect themselves
　　25. What does the word “they” (Para. 3, Line 3) refer to?
　　A) The animal-protecting organizations.
　　B) The organizations that will talk with the research community.
　　C) Those who support the use of animals in research.
　　D) Those who support the animal-protection organizations.