自然学科是托福阅读文章题材中比较常见的类型，本系列为大家汇总整理了多篇托福阅读自然科学类文章，大家在托福备考时可以有针对性的进行复习，本篇为大家带来的是The Sun，并附有相应的练习，希望大家都能顺利拿下托福阅读高分。
The Sun
Keywords: temperature, core, corona, layers, rays
The temperature of the Sun is over 5,000 degrees Fahrenheit at the surface, but it rise 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 theoutside 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 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 spike like 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. The word "great" in line 4 is closest in meaning to
(A) dangerous
(B) unknown
(C) variable
(D) strong
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 word "one" in line 13 refers to
(A) the Sun
(B) the corona
(C) an eclipse
(D) the surface
5. The purpose of the special instruments mentioned in line 14 is to
(A) magnify the image of the Sun.
(B) block out the Sun's intense light
(C) measure the amount of energy emitted by the Sun
(D) photograph the Sun
6. It can be inferred from the passage that a clear view of the Sun's outer layer is usually prevented by
(A) the Sun's rays
(B) an eclipse
(C) lack of light
(D) the great distance
7. The word "sensational" in line 17 is closest in meaning to
(A) spectacular
(B) predictable
(C) bizarre
(D) constant
8. According to the passage, as the corona rays reach the planets, they become
(A) hotter
(B) clearer
(C) thinner
(D) stronger
9. The paragraphs following the passage most likely discuss 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) The scientists who study astronomy
10. Where in the passage does the author compare the light of the Sun's outermost layer to that of another astronomical body?
(A) Lines 2-3
(B) Lines 9-10
(C) Lines 16
(D) Lines 22-23
参考答案：DBACB ACCAC
以上就是为大家整理的托福阅读自然科学类文章之The Sun，希望能够帮助大家备考。前程百利祝大家都能取得理想的考试成绩。
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