问题 选择题

下列说法中正确的是(   )

A.镍氢电池、锂离子电池和锌锰干电池都是二次电池

B.燃料电池是一种高效且不会污染环境的新型电池

C.化学电池的反应基础是复分解反应

D.铅蓄电池放电的时候正极是Pb,负极是PbO2

答案

答案:B

选项A错在锌锰电池肯定是一次性电池,锂电池大多为二次电池;选项C中,化学电池的反应基础应是氧化还原反应;选项D中,铅是金属只能失去电子,故应为负极。

改错题

短文改错。

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共

有10处语言错误,每句中最多有两处。每处错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(/)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:

1.每处错误及其修改均仅限一词;

2. 只允许修改10处,多者(从第11处起)不计分。

Dear friends,

     I'm awfully sorry to hear that horrible and severe earthquake unexpectedly hit your hometown.

Faced with such a rarelyseen disaster, you remain as calm and strongwilled that we are all moved

to tear. A friend in need is a friend indeed. Think about your present situation, you can not wait a

minute to make every bit of our effort to help you. I, as for chairman of the Students' Union, on

behalf of all my schoolmates, express our most sincerely pity and care for you. Besides, we made

a donation of 120,000 yuan to you, expecting that it can help you go through the difficult. A better

hometown can be rebuilt. Remember we won't  be far away as you need any help!

                                                                                      Yours sincerely,

                                                                                              Li Hua

_______________________________________________________________________________

问答题 简答题