B: How can computers be used in so many fields?

　　A: The Internet was only used by the government in the 1960s, but in the early 70s, universities, hospitals and banks 27_________(allow) to use it. However, computers were still very expensive and the Internet was difficult to use. By the start of 1990s, computers became cheaper and easier to use. Scientists had also developed software 28________ helped people “surf” the Internet easily.

　　B: And now it is 29_________(convenience) to surf the Internet than ever before, isn’t it?

　　A: Yeah. Today it is easy to get online and millions of people use the Internet every day. 30__________ (send) emails is more and more popular among students.

　　三．阅读理解（每题5分，共30分）

　　A

　　Chimps(黑猩猩) will cooperate in certain ways, like gathering in war parties to protect their territory. But beyond the minimum requirements as social beings, they have little instinct (本能) to help one another. Chimps in the wild seek food for themselves. Even chimp mothers regularly decline to share food with their children. Who are able from a young age to gather their own food.

　　In the laboratory, chimps don抰 naturally share food either. If a chimp is put in a cage where he can pull in one plate of foodE for himself or, with no great effort, a plate that also provides food for a neighbor to the next cage, he will pull at random ---he just doesn抰 care whether his neighbor gets fed or not. Chimps are truly selfish.

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