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PETS2模拟题
阅读下面短文,从短文后所给各题的四个选项（A、B、C和D）中选出能填入相应空白处的最佳选项，并在答题卡上将该项涂黑。
Washoe is a young chimpanzee (黑猩猩). She is no 1 chimpanzee, though. Scientists are doing research 2 her. They want to see how civilized (驯化) she can 3 . Already she can do many things a human being does.For example, she has been learning how to exchange 4 with people. The scientists are teaching her 5 language.
