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问题 选择题

下列关于食物链的说法，哪项是正确的[ ]

A．食物链是生态系统中能量流动的渠道

B．寄生食物链是陆地生态系统中主要的食物链

C．沿着食物链的方向，动物个体越来越大

D．在食物链中，根据动物的食性，每种动物只能归属于某一个特定的营养级中

答案

答案：A

单项选择题

Many people are surprised when they find the Internet(因特网)was set up in the 1960s. At that time, computers were large and expensive. Computer networks(网络) didn’t work well. If one computer in the network broke down, then the whole network stopped. So a new network system (系统) had to be set up. It should be good enough to be used by many different computers. If a part of the network was not working, information could be sent through another part. In this way computer network system would keep on working all the time.
At first the Internet was only used by the government, but in the early 1970s,universities(大学) ,hospitals and banks were allowed(允许) to use it too. However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became cheaper and easier to use.
Today it is easy to get on-line(上网) and it is said that millions of people use the Internet every day. Sending e-mail is more and more popular among students.
The Internet has now become one of the most important parts of people’s life.

The word" information" may probably mean

A. letter


B. message

C. number
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填空题

犯罪案件中（）是广泛存在的，是犯罪行为的（），这是不以人的意志为转移的规律。
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