C．when

　　D．what

　　答案：D　what引导一个宾语从句，作介词in的宾语。

　　20．A.common B．popular

　　C．special

　　D．splendid

　　答案：B　篮球现在成了世界上最受欢迎的体育运动之一。

　　Ⅴ.阅读表达

　　Do Dogs Understand Us?

　　Be careful what you say around your dog. It might understand more than you think.

　　A border collie named Rico recognizes the names of about 200 objects, say researchers in Germany. The dog also appears to be able to learn new words as easily as a 3－year－old child. Its word－learning skills are as good as those of a parrot or chimpanzee(黑猩猩)．

　　In one experiment, the researchers took all items that Rico is_supposed_to_know_and_divided_them_into_20_groups_of_10_objects. Then the owner told the dog to go and fetch one of the items and bring it back. In four texts, Rico got 37 out of 40 commands right. As the dog couldn't see anyone to get clues, the scientists believe Rico must understand the meanings of certain words.

　　In another experiment, the scientists took one toy that Rico had never seen before and put it in a room with seven toys whose names the dog already knew. The owner then told Rico to fetch the object, using a word the dog had never heard before.

　　The correct object was chosen in seven out of 10 tests, suggesting that the dog had worked out the answer by process of elimination(排除法). A month later, Rico remembered half of the new names, which is even more impressive.

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