问题 单项选择题

地球温度的保持得益于薄薄的大气层,当太阳光射向地球时,大气层吸收其中大量的红外线以及波长较短的紫外线,它们都会使气温升高,从而在向外太空辐射出一部分红外线时也向地面发出红外线,而未被大气吸收其他太阳光射向地面时,引起地面温度度上升,地球,一部分消失至太空。这样地面温度、大气温度就能够保持在一个相对恒定的数值范围之内,月球就因为缺乏这样的大气层而骤冷骤热。这种“温室效应”在金星中同样存在,只是因为它的云层过厚,且二氧化碳是主要成分,而二氧化碳是气体中主要吸收红外线的类型,这使金星的温度要比地球高许多倍。根据上文,以下选项可以推断为正确的是( )。

A.大气热量的来源包括:太阳辐射、地面辐射以及大气逆辐射。这些都使大气的温度能够升高

B.如果大气辐射增加,大气的温度会因此而升高,地面的温度也会因此而上升

C.大气辐射和大气逆辐射本质上一样,只是由于热量来源不同,辐射后的红外线走向不一样而已

D.红外线的吸收是引起温度上升的主要原因,月球上因为缺乏像金星一样富含二氧化碳的大气层,所以即使在最高温度时,也没有金星的温度高

答案

参考答案:C

解析:[解题思路] A项错误在于大气逆辐射是大气热量丧失的一种表现,而不是大气热量的来源;B项错误,大气辐射也是大气热量的散失,所以大气温度应该会降低,
地面温度则会升高;C项正确,大气辐射和大气逆辐射都是大气热量的散失,只不过大气辐射的热量来源是太阳辐射,而热量去向是太空和地面,大气逆辐射的热量来源特指地面辐射,热量去向也特指吸收地面辐射后返给地面热量;D项错误,红外线的吸收并不是所有星球温度上升的主要原因,至于月球、金星认的温度高,根据文窟并不能推断出。所以答案为C。

阅读理解

The nervous-looking young man had waited for a few moments—outside the jeweler’s before he got enough courage to enter. He was warmly greeted by a young assistant. James felt a rush of blood to his face as he explained he would be bringing in his future wife to choose a birthday present. The assistant listened carefully and told him he’d better buy a necklace. He wasn’t used to buying jewellery and was a little worried about over-spending. After some discussion as to a reasonable price and the type, the assistant showed him dozens of necklaces and helped him to choose. At last James chose one and left the shop promising to return at five o’clock. When, half an hour later than planned, James did return to the shop with his future wife, Laura, the assistant acted as if she had never seen him before. When she was asked to show them some necklaces, she first brought out some inexpensive ones for them to choose, and then gave them the one she had prepared. A choice was soon made and they went away satisfied. James would certainly come back to buy what he wanted.

52. A good title for this passage is________.

A. A Clever Assistant                 B. Buying a Birthday Present

C. How to Choose a Necklace          D. A Brave Young Man

53.The word “overspending” in this passage means__________.

A. spending too much money

B. spending too much time

C. spending more time than he planned

D. spending too much time and too much money

54. When James told the assistant why he wanted to buy a present, his face_______.

A. turned pale                   B. turned  red       C. turned yellow                 D. turned black

55. James and Laura reached the shop at        .

A. 4:30       B.5:00         C.5:30         D.6:00

56. James would come back to buy what he wanted because_______.

A. the assistant knew how to satisfy the people who came to buy things

B. the necklace was good

C. Laura liked the necklace

D. the assistant who served James was very beautiful

判断题