问题 阅读理解

阅读理解。

     Waste can be seen everywhere in the school. Some students ask for more food than they can eat and

others often forget to turnoff the lights when they leave the classroom. 

     They say they can afford these things. But I don't agree with them.

     Waste can bring a lot of problems. Although China is rich in some resources (资源), we are short of

(缺乏) others, for example, fresh water (淡水). It is reported that we will have no coal (煤) or oil to use

in 100 years. So if we go on wasting our resources, what can we use in the future and where can we

move? Think about it. I think we should say no to the students who waste things every day. Everybody

should stop wasting as soon as possible.

     In our everyday life, we can do many things to prevent waste from happening, for example, turn off

the water taps (水龙头) when we finish washing, turn off the lights when we leave the classroom, try

not to order more food than we need, and so on. Little by little, everything will be changed. Waste can

be stopped one day if we do our best.

1. From the passage we know that some students often ______ in the school. [ ]

A. eat too much

B. don't work hard

C. waste things

D. throw rubbish everywhere

2. Which is not mentioned in this passage? [ ]

A. Fresh water.

B. Forest.

C. Oil.

D. Coal.

3. What may happen in 100 years? [ ]

A. We may still have enough oil.

B. We may still have enough coal.

C. We may have a bottle oil.

D. We may have no coal or oil to use.

4. Which of the following is right? [ ]

A. Waste brings problems.

B. Waste can bring no problem.

C. China is rich in fresh water.

D. Students never waste things.

5. Which is the best title (题目) of this passage? [ ]

A. Stop wasting

B. School lift

C. Waste in the school

D. Rich Resources in China

答案

1-5: CBDAA

单项选择题
单项选择题

根据下文回答41-45题:离岸流,又称回卷流,是一股射束似的狭窄而强劲的水流,它以垂直或接近垂直于海岸的方向流向外海。其宽度一般不超过10米,长度一般在30-50米之间,有的长达700-800米;流速可高达每秒2米以上,持续时间为两三分钟甚至更长。离岸流包括三部分:裂流根是离岸流的源头,也就是水源汇聚区;流颈是离岸流的通道,水流急速而狭窄;流头是离岸流向深海扩散的扇形区域。在平缓而漫长的沙岸或泥岸,海水冲向海滩后再缓缓回落,一般构不成强劲的离岸流。但如果冲向海滩的海水因某种扰动聚集起来,退落时就可能形成离岸流。如果海岸的地貌特殊,沿着海岸构成沙脊或沙洲,沙脊或沙洲与海岸间又构成了狭长的凹陷带或海沟,那就必定会产生离岸流。因为这种情况下,波浪有充足的动能漫过沙脊或沙洲进入凹陷带冲上海滩,但回落的海水却因消耗了太多能量难以再越过沙脊或沙洲返回大海。于是凹陷带中的海水会越聚越多,最终大量的海水便从沙脊或沙洲上的某几处较低的缺口冲决而出,形成了强劲的离岸流。离岸流行踪____,其裂流根、流颈和流头均隐藏在海中,与周围海水并无分界,而且无声无息,因此很难被发现。它的发生常常使人猝不及防,可能倏忽之间就把好几个人卷进大海,又在一两分钟后消失无踪。它能量巨大,有时连海面上的救生艇也会被它拖进海中。因此,离岸流是个典型的隐形杀手,厦门椰风寨海滨浴场每年都有二三十人因遭遇离岸流溺水而亡。不过离岸流也并非一无是处。毗邻海岸的发电厂尤其是核电厂,可以将热废水的排出口设置在离岸流发生处,借助于离岸流的流势提高热废水的扩散速度,增大其扩散范围,从而降低周围海水的升温幅度,避免过度影响生态平衡。世界四大渔场之一的秘鲁渔场的形成也与离岸流有关。

离岸流的哪一特点,与它成为隐形杀手无关?()

A.垂直于海岸流向外海

B.具有突发性

C.能量巨大

D.隐蔽性强