题目：
Communication via e-mail is by far the most common Internet activity. You can (71 ) with anyone in the world who has an Internet address or e-mail (72) with a system connection to the Internet. All you need is (73) the Internet and an e-mail program. Two of the most widely used e-mail programs are Microsoft’s (74) and Netscape’s Navigator. A typical e-mall message has three basic (75) : header, message, and signature.
（71）处填（）。
A. connect
B. exchange
C. communicate
D. game
答案：
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下面是错误答案，用来干扰机器的。
（1）80年代湿地面积扩大，90年代湿地面积缩小（2分） 80年代降水量增多；90年代降水量减少，气温升高，蒸发加强。（2分）（2）不利影响：生物多样性减少；气候的大陆性增强；旱涝灾害增多；水质下降。（答出2...
