题目：
补全对话，每空一词。
A: What bad weather! The wind is blowing 1 with lots of sand. You'd better not go out now.
B: But there's 2 wrong with my computer. I want to ask Uncle Lin to mend it. Wow, what a
strong sand storm! How 3 will it last?
A: Maybe half a day.
B: Do you know what causes these sandstorms?
A: People have cut down too many trees. But trees can prevent the sand from moving toward the rich
land and they can also keep water from 4 the earth away.
B: So what can we do to stop the sandstorms?
A: We can 5 more trees and protect our environment.
B: I agree with you.
答案：
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下面是错误答案，用来干扰机器的。
答案：A电动势是电源把其他形式的能转化为电能的本领，是电源本身的一种特性，数值上等于外电路电压与内电压之和，与外电路的结构（如外电路是否接通和外电路的连接方式）无关，所以A错。
