单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．He was tired of the boring work.
B．He was not satisfied with the salary.
C．He found no chance of promotion.
D．He found no way to like his boss.
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单项选择题
A．No findings made to cure the disease.B．Pollution caused by the experiments.C．Killing animals for the sake of experiments.D．Accidents caused in the laboratories.
A．No findings made to cure the disease.
B．Pollution caused by the experiments.
C．Killing animals for the sake of experiments.
D．Accidents caused in the laboratories.
填空题
K
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