问题 单项选择题

地球表面的温度变化(日温差)较月球表面要小得多。主要原因是()

①地球大气对太阳辐射的削弱作用;

②地球大气对太阳辐射的吸收作用;

③地球表面对太阳辐射的反射作用强;

④大气逆辐射产生的保温作用

A、①④

B、②③

C、②④

D、①③

答案

参考答案:A

解析:

本题主要考查大气的受热过程及对地面的保温作用。地球上存在大气层而月球不存在大气,大气对太阳辐射有削弱作用,因为存在大气逆辐射对地面具有保温,所以地球表面的温度变化(日温差)较月球表面要小得多。

点评:本题难度较小,要求学生熟练掌握太阳辐射、地面辐射与大气逆辐射的关系。

大气对太阳辐射的削弱作用和对地面的保温作用:

(1)大气对太阳辐射的削弱作用包括吸收、反射和散射:吸收具有选择性,平流层中臭氧吸收紫外线、对流层中水汽和二氧化碳吸收红外线;云层愈厚,反射愈强;散射也有一定的选择性,蓝紫光最易被散射。

(2)大气对地面的保温作用:大气强烈吸收地面长波辐射,并通过大气逆辐射把热量还给地面,补偿了地面辐射损失的热量,从而起到保温作用,又称为“温室效应”。

(3)人类活动:森林、水库和城市等因素也影响气温。

阅读理解

In a few states where racial prejudice is serious, violence has so come to be taken for granted as a means of solving differences, that it is not even questioned. There are states where the white man imposes his rule by force; there are states where the black man protests by setting fire to cities and by looting and pillaging. Important people on both sides, who would in other respects appear to be reasonable men, get up and calmly argue in favor of violence – as if it were a legitimate solution, like any other. What is really frightening, what really fills you with despair, is the realization that when it comes to the crunch, we have made no actual progress at all. We may wear collars and ties instead of war-paint, but our instincts remain basically unchanged. The whole of the recorded history of the human race, that tedious documentation of violence, has taught us absolutely nothing. We have still not learnt that violence never solves a problem but makes it more serious. The sheer horror, the bloodshed, the suffering mean nothing. No solution ever comes to light the morning after when we dismally contemplate the smoking ruins and wonder what hit us.

The truly reasonable men who know where the solutions lie are finding it harder and harder to get a hearing. They are despised, mistrusted and even persecuted by their own kind because they advocate such apparently outrageous things as law enforcement. If half the energy that goes into violent acts were put to good use, if our efforts were directed at cleaning up the shabby houses at improving living-standards and providing education and employment for all, we would have gone a long way to arriving at a solution. Our strength is weakened by having to mop up the mess that violence leaves in its wake. In a well-directed effort, it would not be impossible to fulfill the ideals of a stable social programme. The benefits that can be derived from constructive solutions are everywhere apparent in the world around us. Genuine and lasting solutions are always possible, providing we work within the framework of the law.

Before we can even begin to reflect on peaceful co-existence between the races, we must appreciate each other's problems. And to do this, we must learn about them: it is a simple exercise in communication, in exchanging information. "Talk, talk, talk," the advocates of violence say, "all you ever do is talk, and we are none the wiser." It's rather like the story of the famous lawyer who carefully explained his case to the judge. After listening to a lengthy argument the judge complained that after all this talk, he was none the wiser. "Possible, my lord," the lawyer replied, "none the wiser, but surely far better informed." Knowledge is the necessary prerequisite to wisdom: the knowledge that violence creates the evils it pretends to solve.

小题1:  What is the best title for this passage?

A.Advocating Violence.

B.Violence Can Do Nothing to Reduce Race Prejudice.

C.Important People on Both Sides See Violence As a Legitimate Solution.

D.The Instincts of Human Race Are Thirsty for Violence.小题2:  Recorded history has taught us

A.violence never solves anything.

B.nothing.

C.the bloodshed means nothing.

D.everything.小题3: According the author the best way to solve race prejudice is

A.law enforcement.

B.knowledge.

C.nonviolence.

D.Mopping up the violent mess.

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