单项选择题

When murders and terrorist attacks occur the police ______.

A．prefer to wait for the criminal to give himself away
B．spend a lot of effort on trying to track down their man
C．try to make a quick arrest in order to keep up their reputation
D．usually fail to produce results
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单项选择题
It is essential for a policeman to be trained in criminal law ______.
A．so that he can catch criminals in the streets
B．because many of the criminals he has to catch are dangerous
C．so that he can justify his arrests in court
D．because he has to know nearly as much about law as a professional lawyer
单项选择题
The last sentence of this passage implies that ______.
A．If the experiments' results can be applied to the practice, the customers will be very likely to buy things according to the ads.
B．If the Harvard group can succeed in finishing the research, they will use it in attracting more and more and more and more consumers into the market.
C．The financial supporting corporations such as Coca Cola, General Motors can employ the experiments in their own marketing.
D．The consumers may discover that those ads will always annoy them by jingling out of their heads and cause them headaches.
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