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问题 单项选择题

带电的电器发生火警时，应用下列哪一种灭火器具?

A.消防水带 

B.二氧化碳灭火器 

C.泡剂灭火器

答案

参考答案：B

填空题

小柯做了一个如图所示的“魔力转椅”实验，他坐在普通转椅上用力扇动手中的扇子，椅子不转；在普通转椅的立柱和底座金属筒之间装上滚动轴承和钢珠后，用力扇动手中的扇子，“魔力转椅”随即转动．

（1）“魔力转椅”是采用______的方法减小摩擦力的，

（2）扇子能扇转“魔力转椅”是利用了______原理．
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改错题
短文改错
此题要求改正所给短文中的错误.对标有题号的每一行作出判断。
每行只有一个错误,请按下列情况改正：
该行多一个词：把多余的词用斜线(\ )划掉,在该行右边横线上写出该词,并也用斜线划掉
该行缺一个词：在缺词处加一个漏字符号(^),在该行右边横线上写出该加的词
该行错一个词：在错的词下划一横线,在该行右边横线上写出改正后的词
     Last summer I go to America and studied at a language                                            1.________
school. I had many wonderful experience, but I also                                                      2.________
had a sad one. One day, the school held party, where I                                                 3.________
invited to talk about Beijing. After that they asked me lots of                                         4.________
things about China. But I couldn't explain it in English                                                    5.________
clearly. I felt sadly. I learnt a lesson from this experience. I                                            6.________
have already studied English for eight years, I can't use it                                               7.________
very good. I must work hard to improve my spoken English                                          8.________
so that I will not be able to communicate freely with foreigners.                                      9.________
I hope I can be a bridge between China and others countries                                        10.________
in the future.
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