我们身边常见的下列物质中，属子氧化物的是[ ] A．氧气 B．水 C．空气 D．

一列队伍长50米，行进速度2.5m/s，经过一座100m的山洞，当队伍全部穿过山洞时，总共需要 [ ]

A、60s

B、40s

C、50s

D、80s

上部样的取样点应在罐内油层顶液面下深度的（）处。

A、5／6

B、1／2

C、1／3

D、1／6

Many people go to school for a good education . They learn languages ,history ,maths and other lessons . School education is very important and useful . Yet no one can learn everything from school . No matter how much a teacher knows , he cannot teach his students everything they want to know . His work is to show his students how to learn . He teaches them how to read and how to think . So , much more is to be learned outside school by the students themselves .

It is always more important to know how to study by oneself . It is quite easy to learn something in a language or a formula in maths , but it is difficult to use a formula in finding the answer to a maths problem . Great inventors do not get everything from school but they can invent many things and change the world a lot . Though Thomas Edison invented many things he didn’t have much school education . How do they do all these ? Because they know how to study . A lot of things are not taught in the classroom . They get knowledge from books outside school . They work hard all their lives , and the most important thing is that they know how to use their head .

31. What do many people go to school for ?

A. To make friends                  B. To get everything

C. To get a good education            D. To study by themselves

32. What should a student learn to do from school ?

A. Try to remember more knowledge and formulas .

B. Try to learn how to read and how to think . 

C. Try to remember what the teachers teach .

D. Try to invent the world .

33. How can an inventor invent things ? The most important thing is how

to         .

A. be a great inventor                B. study by himself

C. use his head well                  D. remember what he’s been taught

34. The word formula in this passage means          .

A. 数学题       B. 公式        C. 几何图形        D. 数学用表

35. Which of the following shows the most important idea of this passage ?

A. School education is important for a person .  

B. A student can not learn everything from school .

C. A student should learn how to remember a formula .

D. Inventors can invent things and change the world a lot .

在小涛18岁的时候，因为父亲工作变动，一家人搬迁到上海定居，小涛也被转入上海的一所中学继续读书。换了新的环境，对周围的一切都不熟悉，身边一个认识的朋友都没有，这让小涛感觉很孤独。
搬入上海没多久，小涛的母亲在一次车祸中不幸去世了，这给小涛带来了沉重的打击。他开始逃学，整日将自己关在房间里，不爱说话，不与别人来往，就连父亲对于他的关心也给予拒绝。父亲看到儿子这种状态，很担心他会得抑郁症，但又不知该如何帮助儿子。
[问题]

“烩”菜一般都要勾薄芡，烩菜的特点是（），口味鲜浓，色彩鲜艳。

A.汤少

B.汤宽汁浓

C.汁淡

D.汁厚