Questions 14 to 17 are based on the following passage,

(14) Most people think of astronomers as people who spend their time in cold observatories peering through telescopes every night. In fact, a typical astronomer spends most of his/her time analyzing data and may only be at the telescope for a few weeks of the year. Some astronomers work on purely theoretical problems and never use a telescope at all. You might not know how rarely images are viewed directly through telescopes. The most common way to observe the skies is to photograph them. The process is very simple. First a photographic plate is coated with a light-sensitive material. (16) The plate is positioned so that the image received by the telescope is recorded on it. (15) Then the image can be developed, enlarged and published so that many people can study it. Because most astronomical objects are very remote, the light we receive from them is rather feeble. But by using a telescope as a camera, (17) long time exposures can be made. In this way，objects that are a hundred times too faint to be seen can be photographed by just looking through a telescope.

 

题目

Passage 2

Questions 14 to 17 are based on the following passage. At the end of the passage? you will be given 20 seconds to answer the questions.

Now, listen to the passage.

14. According to the passage, what do people often think about astronomers?

A. They spend most of their time looking through telescopes.

B. They are constantly analyzing data.

C. They often live near observatories.

D. They devote a lot of time to theoretical problems.

15. What is the advantage of photographing the skies?

A. The cost of equipment needed is reduced.

B. Fewer data need to be analyzed.

C. The images can be studied by different astronomers.

D. The natural colors of astronomical objects can be captured.

16. What do astronomers use photographic plate for?

A. Decreasing the time it takes to photograph objects.

B. Avoiding using a telescope.

C. Sharpening the color of what they observe.

D. Obtaining images of distant objects.

17. What is the one reason astronomers make long time exposures?

A. To spend less time at their telescopes.

B. To overcome the problem of weak light.

C. To take more photographs.

D. To photograph astronomical objects without using a telescope.

 

答案解析

Passage 2

14. A细节题。原文说“大部分人都认为天文学家就是每个晚上都在冰冷的天文台用 望远镜观察天空的人”。故A项符合题意。

15. C细节题。文章指出通过对天空拍照，照片可以被冲洗出来，并被放大和发表，这 样就可以有很多人来参与研究。故选C项。

16. D细节归纳题。文中说照相平盘可以记录下由望远镜捕捉到的物体，然后把其拍成 照片，故D项意思正确。

17. B细节题。文章后面讲到由于大部分天体距离很远，所以我们能捕捉到的它们所 发出的光线也很微弱，但如果用望远镜充当照相机就可以进行长时间曝光，以此将 物体拍下来。故B项正确。