﹣32+（﹣3）2的值是[ ] A．﹣12 B．0 C．﹣18 D．18

We have to ____ ourselves when we are away from home.

A．look at

B．look for

C．look up

D．look after

文中共有10处语言错误，要求你在错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号(/\)，在其下面写上该加的词。

删除：把多余的词用斜线(＼)划掉。

修改：在错的词下划一横线，在该词下面写上修改后的词。

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11处起）不计分。

Like most of my schoolmates, I have neither brothers nor sisters—on other words, I am an only child. My parents love me dearly of course and will do all they can make sure that I get a good education. They did not want me to do any work at family; they want me to devote all my time on my studies so that I’ll get good marks in all my subject. We may be one family and live under a same roof, but we do not seem to get much time to talk about together. It looks as if my parents treat me as a visitor and a guest. Do they really understand their own daughter? What things are in other homes, I wonder.

触发器是时序电路的基本单元，一般常用的有（）。

A、RS触发器

B、JK触发器

C、D触发器

D、RS触发器、JK触发器和D触发器

土壤的渗吸速度与哪几种因素有关？

最早开辟了从欧洲通往印度新航线的航海家是（）

A.哥伦布

B.达·伽马

C.迪亚士

D.麦哲伦