下列实验操作及方法正确的是（） A．将带火星的木条伸入集

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问题选择题

下列实验操作及方法正确的是（　　）

A．将带火星的木条伸入集气瓶中，检验集气瓶中氧气是否收满

B．将pH试纸浸入烧杯中的溶液，测定烧杯中溶液的酸碱性

C．桌面上的酒精灯倒翻，酒精着火燃烧起来，立即用湿抹布扑灭

D．实验准备时，称取2g氢氧化钠固体，并用称量纸包好以备实验时用

答案

答案：C

改错题

Although the first computer was only introduced

to China in the mid-1950s, since then ,a number of computers 1._____

used in different fields has been grown rapidly. 2.______

Computers are now affected millions of people in countless ways 3.______

every day. They are used to predict the weather, examine the 4.______

ocean,and to develop defence systems. They depend more and more 5._____

heavy on computers. There is no reason to think that their use 6._____

will decrease.By the contrary ,they will develop more rapidly 7. ______

as you think.If you are among those who still don't know much 8.______

about computers, you will lost in the future.

9.______

You should learn what you can while you still have the chance

10.______

单项选择题 B型题

导致3人以上人身损害后果的医疗事故应在几天内向所在地卫生行政部门报告（）

A.6小时

B.12小时

C.24小时

D.48小时

E.72小时