DProtests (抗议) at the use of animals in research have taken on a new and fearful character

DProtests (抗议) at the use of animals in research have taken on a new and fearful character in Britain with the attempted murder of two British scientists by the terrorist (恐怖分子的) technique of the pre-planted car–bomb .
The research munity (社团) will rightly be alarmed at these developments which have two aims :to draw public attention and to frighten people working in research with animals . The scientists insist that everything should be done to identify those responsible for the crimes and to put them on trial . The Defense Research Society has taken the practical step of offering a reward of £10，000 for information leading to those responsible , but past experience is not encouraging . People are unlikely to be attracted by such offers . The professional police will similarly be challenged by the problem of finding a needle in a haystack .
That is why the intellectual (知识分子) munity in Britain and elsewhere must act more strongly in its own defense . 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 aims of defending the interests of animals that they should declare clearly where they stand on violence towards people . And it will not be enough for the chairman and chairwoman of these organizations to make placatory (安抚的) statements on behalf of all their members . These people should also promise 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 .
67．The words “these developments” (Linel , Para .2 ) most probably refer to      .
A．the use of animals in research
B．the acts of violence against scientists
C．the techniques of planting bombs in cars
D．setting up of new animal protection organizations
68．Which of the following is true according to the passage ?
A．The police gave up their efforts to find the criminals .
B．The terrorists escaped with the help of their organization .
C．The attempted murder caused great anxiety among British scientists .
D．People supported the animal protectors in spite of their extremist acts .
69．The author’s purpose in writing this article is to demand that animal-protecting organizations      .
A．give up the use of violence
B．declare their aims clearly
C．continue the dialogue with the scientific munity
D．help to fid those responsible for the attempted murder
70．In the author’s opinion ,     .
A．animal-protecting organizations should be declared illegal
B．the scientists should take effective measures to protect themselves
C．since people can lie , the problem about eh rights of scientists can’t be solved
D．animal-protecting organizations should help the police to fight against the acts of violence
against scientists B