12千克比15千克少______%.20吨增加______%后是25吨.

题型:填空题

问题:

12千克比15千克少______%.20吨增加______%后是25吨.

考点:百分数的计算,百分数的应用题
题型:填空题

右图漫画中的小主人公需要(   )

A.合理安排时间,提高学习效率

B.让家长加强督促与管理

C.制定学习计划,专心学习

D.克服依赖性,学会自主学习

题型:填空题

你与同学合作测量人上楼的功率的实验中,所需要的测量工具是___________________;需要测出的物理量有_____________;功率表达式P=____________。

题型:填空题

阅读理解。

     Parents should stop blaming themselves because there's not a lot they can do about it. I mean the teenager

problem. Whatever you do or however you choose to deal with it, at certain times a wonderful, reasonable and

helpful child will turn into a terrible animal.

     I've seen friends deal with it in all kinds of different ways. One strict mother insisted that her son, right

from a child, should stand up whenever anyone entered the room, open doors and shake hands like a gentleman.

I saw him last week when I called round. Sprawling himself (懒散地躺) on the sofa in full length, he made no

attempt to turn off the loud TV he was watching as I walked in, and his greeting was no more than a quick

glance at me. His mother was ashamed. "I don't know what to do with him these days," she said.

     "He's forgotten all the manners we taught him." He hasn't forgotten them. He's just decided that he's not

going to use them. She confessed (坦白) that she would like to come up behind him and throw him down from

the sofa onto the floor.

     Another good friend of mine let her two daughters climb all over the furniture, reach across the table, stare

at me and say, "I don't like your dress; it's ugly." One of the daughters has recently been driven out of school.

The other has left home.

     "Where did we go wrong?" their parents are now very sad. Probably no one is to blame on this issue.

1. This text is most probably written by _____.

A. a specialist in teenager studies

B. a headmaster of a middle school

C. a parent with teenage children

D. a doctor for mental health problems

2. The underlined word "it" in the second paragraph refers to _____.

A. the change from good to bad that's seen in a child

B. the way that parents often blame themselves

C. the opinion that a child has of his parents

D. the advice that parents want their children to follow

3. From the second example we can infer that the parents of the two daughters _____.

A. pay no attention to them

B. are too busy to look after them

C. have come to hate them

D. feel helpless to do much about them

4. What is the writer's opinion about the sudden change in teenage children?

A. Parents have no choice but to try to accept it.

B. Parents should pay still more attention to the change.

C. Parents should work more closely with school teachers.

D. Parents are at fault for the change in their children.

题型:填空题

当频率低于下列何种程度时,声波振动颅骨,移动式骨传导起主要作用()。

A.2000Hz

B.1000Hz

C.800Hz

D.500Hz

E.250Hz

题型:填空题

太平天国运动中翼王、南王分别是谁?()

A.洪秀全、石达开

B.韦昌辉、杨秀清

C.石达开、冯云山

D.萧朝贵、冯云山

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