从空中以40m/s的初速度平抛一个重为10N的物体，物体在空中运动3s落地，不计

阅读理解。

     We send our children to school to prepare them for the time when they will be big and will have to

 work for themselves. They learn their own language so that they will be able to tell others clearly what they

  want and what they know, and understand what others tell them. They learn foreign languages in order to

  be able to understand the people from other countries and make themselves understood. They learn

 history to know something about human beings they meet every day. What they learn at school is, of

 course, quite useful, but is that the only reason (原因) why they go to school?

     No. There is more in education than just learning facts. We go to school, above all, to learn how to

  learn, so that when we have left school, we can continue to learn. A man who really knows how to learn

  will always be successful, because whenever he has to do something new, he will quickly teach himself

 how to do it in the best way. The uneducated person, on the other hand, is either unable to do something

  new, or does it badly. So the purpose (目的) of school is not just to teach the students these useful

 subjects but teach the way to learn.

1. Children are sent to school because _____.

    A. they can grow fast at school

    B. they have to work for themselves at the moment

    C. the parents have to prepare them for their future

    D. they are able to learn facts

2. Why do they learn languages?Because they will _____.

    A. make friends with others

    B. be able to speak to and hear others clearly

    C. be able to understand others

    D. make themselves understood

3. The sentence"There is more in education than just learning facts"means _____.

    A. learning facts isn't the only thing in education

    B. there are more facts to learn in education

    C. education is just learning facts

    D. learning facts is more important in education

4. What does an educated person do when he meets something new? He will _____.

    A. try his best to do it

    B. quickly find the best way out

    C. be unable to do it well?

    D. know how to learn

5. The main idea of the text is that_____.

    A. children must go to school

    B. the subjects at school are useful

    C. parents should send their children to school

    D. children should be taught not only to learn but how to learn

商场店庆搞促销活动，全场降价百分之十，写作______，意思是把商品______的价钱当作单位“1”，现在的价钱是原来价钱的______．

下列混凝土外加剂中，能够改善混凝土耐久性的有（）。

A.引气剂

B.早强剂

C.抗冻剂

D.防水剂

E.速凝剂

雷电的危害性有（）。

A、雷电的电磁效应，产生过电压击穿设备绝缘

B、雷电的热效应，烧毁电气设备

C、雷电的机构效应，击毁电气设备，杆塔和建筑

D、闪络放电烧毁绝缘子

按建筑的耐久年限分，一级耐久年限为（）。

A.100年以上

B.70年以上

C.50年以上

D.15年以下