Question

 The hole in the earth's protective ozone layer（臭氧層）won't repair itself until about two decades later than had been expected, scientists announced.

The ozone layer blocks more than 90 percent of the sun's ultraviolet radiation（紫外線輻射）, helping to make life on Earth possible. For many dacades, ozone was depleted（削減） by chlorine and bromine gas in the air. A hole in the ozone layer formed over the Southern Hemisphere.

Computer models had forecast that the hole would fill back in by 2050. An improved computer model forecasts the recovery won't occur until 2068. The model, fed with fresh data from statellites and airplanes, was supported by the fact that it accurately reproduced ozone levels in the Antarctic stratosphere（平流層）over the past 27 years.

The ozone hole is actually more of a broad region with less ozone than ought to occur naturally. It is not limited to Antarctica, as is often believed.

Over areas that are farther from the poles like Africa or the US, the levels of ozone are only three to six percent below natural levels. Over Antarctica, ozone levels are 70 percent lower in the spring. This new method allows us to more accurately estimate（估計）ozone-depleting gases over Antarctica, and how they will decrease over time, reducing the ozone hole area.

Paul Newman, a scientist,said that the ozone hole has not started to become smaller as quickly as expected. They figure it will not become much smaller until 2018, after which time the recovery should proceed more quickly. And the hole will not be filled in again until 2065.

1.According to the passage, the ozone layer _______

A．a(chǎn)bsorbs as much as sunlight as possible

B．protects man against ultraviolet radiation

C．controls the changes in temperature

D．prevents the production of carbon dioxide

2.The improved computer model is believable because _________

A．it was once proved by facts

B．it has been studied for 27 years

C．it was created by many scientists

D．it is related to satellites and airplanes

3.The underlined word “they” in the fifth paragraph refers to ________

A．the levels of ozone

B．ozone-depleting gases

C．the ozone holes

D．the areas far from the poles

 

Answer 1

【答案】

1.B

2.A

3.B

【解析】

試題分析：

1.B 細節(jié)題。根據(jù)第二段1,2行The ozone layer blocks more than 90 percent of the sun's ultraviolet radiation（紫外線輻射）, helping to make life on Earth possible.說明B正確。

2.A 細節(jié)題。根據(jù)第三段2,3，4行The model, fed with fresh data from statellites and airplanes, was supported by the fact that it accurately reproduced ozone levels in the Antarctic stratosphere（平流層）over the past 27 years.說明該模型在過去的27年中得到了證明，故A正確。

3.B 推理題。根據(jù)本句This new method allows us to more accurately estimate（估計）ozone-depleting gases over Antarctica, and how they will decrease over time, reducing the ozone hole area.

說明這里的they是指ozone-depleting gases，故B正確。

考點：考查環(huán)境類短文閱讀

點評：本文講述的是臭氧層收到破壞，人們在采取模型進行模擬。以細節(jié)題的考查為主，在解答這類問題時要求學生抓住題干文字信息，采用針對性方法進行閱讀，因為這類題的答案在文章中可以直接找到。