抽水蓄能电站

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

_______________________________________________________________________________

用已调整好的托盘天平测量五分硬币的质量，将5枚五分硬币放在天平的左盘内，右盘内放5g砝码，游码在标尺上的位置见图所示，此时天平的横梁平衡，则游码所对应的刻度所示质量为___________g，一枚五分硬币的质量是___________g。

介导体液免疫应答的免疫分子是（）

A.抗体

B.分泌型IgA

C.抗菌肽

D.穿孔素

E.干扰素

结晶釉往往是粘度较大的釉。

提高安全意识和自我保护意识，确保作业人员班前充分休息；班中严格遵章作业，线上施工作业确保()人以上，加强安全防护，来车按规定提前下道等。

A．2

B．3

C．4

D．5