Protests at the use of animals in research have taken a new and fearful character in Britain with the attempted murder of two Br

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问题     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.
    The research community will rightly be alarming at                  【S1】______.
these developments, which have two objectives: to arouse                  
public attention and frighten people working in research                【S2】______.
with animals. The first need is that everything should be                  
done to identify those responsible for the crimes and to put                  
it on trial. The Defence Research Society has taken the                 【S3】______.
practical step of offering a reward of 10,000 pounds for                  
information leading to those responsible, and past experience           【S4】______.
is not encouraging. People are likely to be tempted by such             【S5】______.
offers. The profession police will similarly be confronted              【S6】______.
by the usual problem of finding a needle in a haystack.                    
    That is why the intellectual (知识分子) community in                  
Britain and elsewhere must act more vigorous in its own                 【S7】______.
defence. There are several steps that can be taken, which               【S8】______.
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 stood on            【S9】______.
violence towards people. And it will not be enough for the                  
chairman and chairwomen of these organizations to utter                 【S10】______.
placatory (安抚的) statements on behalf of all their, members.
【S4】

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答案and→but

解析 根据上下文,他们悬赏1万英镑寻找有关罪犯的消息,但收获不大。两句为转折关系而非并列。连词使用错误。
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