正确答案: A

小灯泡接线短路

题目：（2）电路改正后闭合开关，发现电流表的指针偏转，电压表指针没有偏转，则该故障的原因是 （填下列故障原因的代号）

解析：A

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举一反三的答案和解析：

[单选题]Not all people like to work but everyone likes to play． All over the world men and women，boys and girls enjoy (21) ． Since the days of long ago，adults(成年人) and children have called their friends together to spend (22) even days playing games．Sports help people to live(23 ) * They help to keep people healthy and feeling good．When they are playing games，people (24) a lot． This is good for their health． Having(25) with their friends makes them happy．

sports

解析：21．C【解析】此题与下一句中的“playing games”有关系．play games是“运动”，选项为C。

[单选题]16．

worried

[单选题]5． Which is the best title(标题)“the passage?

Online shopping in China

解析：5．B【解析】本文主要介绍了网上购物的优点．故“中国的网上购物”更适合本文的标题。

[单选题]25． What is the best title for this passage?

The Great Influence of Weather,

解析：25.D【解析】从全文来看讲的是天气对人的健康、智力以及感觉的影响，故选D。

[单选题]22． What problems are caused by too much homework?

Feeling stressed and getting short-sighted．

解析：22.C【解析】由原因栏可知大量的作业给学生很大的压力，同时也导致了很多学生近视。

[单选题]4． —Where is my backpack?—_________

It ' s not there

解析：4.D【解析】根据问句知，答语应回答地点，所以选D 项。

[单选题]9． —Is it your pen?— No，It__________ Kate．

may belong to

解析：9．D【解析】belong不用进行时。belong to sb．意为属于某人．it是第三人称单数，C项若为belongs to 也正确。D项情态动词后用动词原形是正确的。