第二节 完型填空 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。 Sally is a young chimpanzee (黑猩猩). She is no 【B1】 chimpanzee, though. Scientists are doing research 【B2】 her. They want to see how civilized(驯化) she can 【B3】 . Already she can do many things a human being does. For example, she has been learning how to exchange 【B4】 with people. The scientists are teaching her 【B5】 language. When she wants to be picked 【B6】 , Sally points out with one finger. She rubs her teeth with her finger 【B7】 , she wants to brush her teeth. This is done after every meal. Sally has also been 【B8】 to find answers to problems. Once she was put in a 【B9】 with food hanging from the ceiling. It was too high to 【B10】 . After she considered the 【B11】 , she got a tall box to 【B12】 . The food was still too high to be reached. Sally found a 【B13】 pole. Then she climbed onto the 【B14】 ,grasped(抓取)the pole, and 【B15】 down the food with the pole. Sally 【B16】 like a human, too. The scientists keep her in a fully furnished house. After a hard 【B17】 in the lab, she goes home. 【B18】 she plays with her toys. She 【B19】 enjoys watching television before going to bed. Scientists hope to 【B20】 more about people by studying our closest relative -- the chimpanzee. 【B1】