Question

【题目】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 (一束束穗状) 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】

试题分析：本文是科普类阅读，讲述太阳上的温度及它的结构是如何的；

【1】D细节理解题。根据第一段提到The sun is so much hotter than the earth that matter can exist only as a gas,因为太阳温度如此的高以至于只能以气体的形式存在，故选D项。

【2】B，主旨题。第二段第一句话Solar astronomers do know that the sun is divided into five layers or zones.为此段的中心句，作者提出，太阳分五层，然后就围绕着这五个层展开论述，故选B项。

【3】D 推断题。根据第第二段提到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.可知太阳的大气层，只包括the corona, chromosphere, photosphere,这三部分，故选D 项。

【4】C 细节理解题。根据第五段提到The rays of gas thin out as they reach the space around the planets.当射线到达行星外层时，会变弱，故选C项。

【5】A推断题。通过对于文章结构的分析，我们可以发现第二段对太阳的构造做了总的论述，共分五层，后三段接了日冕，是对第二段内容的展开，显然后面应该继续介绍太阳的其它层，故选A项。