Question

【題目】The temperature of the sun is over 5,000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The sun is so much hotter than the earth that matter can exist only as a gas, except at the core. In the core of the sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core. However, no one really knows, since the center of the sun can never be directly observed.

Solar astronomers do know that the sun is divided into five layers or zones. Starting at the outside and going down into the sun, the zones are the corona, chromosphere, photosphere, convection zone and finally the core. The first three zones are regarded as the sun’s atmosphere ends and the main body of the sun begins.

The sun’s outermost layer begins about 10,000 miles above the visible surface and goes outward for millions of miles. This is the only part of the sun that can be seen during an eclipse such as the one in February 1979. At any other time, the corona can be seen only when special instruments are used on cameras and telescopes to shut out the glare of the sun’s rays.

The corona is a brilliant, pearly white, filmy light, about as bright as the full moon. Its beautiful rays are a sensational sight during an eclipse. The corona’s rays flash out in a brilliant fan that has wispy spikelike (一束束穗狀) rays near the sun’s north and south poles. The corona is thickest at the sun’s equator.

The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the sun’s corona rays reach the earth, they are weak and invisible.

【1】Matter on the sun can exist only in the form of gas because of the sun’s ______.

A. size B. age C. location D. temperature

【2】With what topic is the second paragraph mainly concerned?

A. How the sun evolved.

B. The structure of the sun.

C. Why scientists study the sun.

D. The distance of the sun from the planets.

【3】All of the following are parts of the sun’s atmosphere EXCEPT the _______.

A. corona B. chromospheres

C. photosphere D. core

【4】According to the passage, as the corona rays reach the planets, they become _______.

A. hotter B. clearer

C. thinner D. stronger

【5】The paragraph following the passage most likely discusses which of the following?

A. The remaining layers of the sun.

B. The evolution of the sun to its present form.

C. The eclipse of February 1979.

D. Scientists will cost more money on researching the corona.

Answer 1

【答案】

【1】D

【2】B

【3】D

【4】C

【5】A

【解析】

試題分析：本文是科普類閱讀，講述太陽上的溫度及它的結(jié)構(gòu)是如何的；

【1】D細(xì)節(jié)理解題。根據(jù)第一段提到The sun is so much hotter than the earth that matter can exist only as a gas,因為太陽溫度如此的高以至于只能以氣體的形式存在，故選D項。

【2】B，主旨題。第二段第一句話Solar astronomers do know that the sun is divided into five layers or zones.為此段的中心句，作者提出，太陽分五層，然后就圍繞著這五個層展開論述，故選B項。

【3】D 推斷題。根據(jù)第第二段提到Starting at the outside and going down into the sun, the zones are the corona, chromosphere, photosphere, convection zone and finally the core. The first three zones are regarded as the sun’s atmosphere ends and the main body of the sun begins.可知太陽的大氣層，只包括the corona, chromosphere, photosphere,這三部分，故選D 項。

【4】C 細(xì)節(jié)理解題。根據(jù)第五段提到The rays of gas thin out as they reach the space around the planets.當(dāng)射線到達(dá)行星外層時，會變?nèi)�，故選C項。

【5】A推斷題。通過對于文章結(jié)構(gòu)的分析，我們可以發(fā)現(xiàn)第二段對太陽的構(gòu)造做了總的論述，共分五層，后三段接了日冕，是對第二段內(nèi)容的展開，顯然后面應(yīng)該繼續(xù)介紹太陽的其它層，故選A項。