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(核心). 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. But since the sun has no solid surface, it is hard to tell where the 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 (日食) 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(刺眼的強(qiáng)光)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. chromosphere

C. photosphere D. core

【4】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】A

【解析】

試題分析：本文主要介紹了太陽(yáng)的相關(guān)知識(shí)，包括太陽(yáng)的環(huán)境和結(jié)構(gòu)等等。

【1】D細(xì)節(jié)理解題。根據(jù)The sun is so much hotter than the earth that matter can exist only as a gas可知太陽(yáng)比地球熱得多所以物質(zhì)只能以氣體的形式存在，故選D。

【2】B推理判斷題。根據(jù)Solar astronomers do know that the sun is divided into five layers or zones.可知第二段主要講的是太陽(yáng)的結(jié)構(gòu)。故選B

【3】D細(xì)節(jié)理解題。根據(jù) the zones are the corona, chromosphere, photosphere, convection zone and finally the core. The first three zones are regarded as the sun’s atmosphere. 可知核心core不屬于太陽(yáng)的大氣的部分，故選D。

【4】A推理判斷題。本文主要講的是太陽(yáng)被分成了五層，介紹了其中的幾層，所以接下去的段落最有可能是討論太陽(yáng)的剩余的層。故選A。