Question

Twinkle, Twinkle Little Star is a lovely song for children, but it has two misunderstandings (误解). First, stars aren’t little. Some may be Earth-sized, but most are bigger than Jupiter, the largest planet in the solar system (太阳系). Second, they don’t twinkle; they shine. And the brightness and color of the light from each star provide information about its temperature, size and even its age. viewing the stars from Earth is a bit like looking at them through a water filter (过滤器) because the air is thick compared to the emptiness of space. What is more, air is always moving, so starlight appears to be moving, too. The air also makes stars appear dimmer (暗淡的) than they would be if we could see them from space.

If you stop and look at the sky carefully on a dark and moonless night, it’s easy to find color differences among stars. The color of a star is a signal of its surface temperature. The hottest stars are blue, and the next hottest are white. Yellow stars like the sun are next, while red stars are the coolest of the visible (可见的) stars. Many red stars are so dim that people can’t see them at all, and some stars hardly send out any light at all. One reason that stars different in brightness is that hotter stars produce more energy than cooler ones, but another important reason is that some are much bigger than others.

Some stars appear brighter to humans simply because they’re closer. Astronomers rank (排列) the brightness of stars which are seen from Earth by giving them a name known as magnitude (光度) ---the smaller the magnitude, the brighter the object. They have also designed a number that ranks stars according to how bright they are when compared to each other. With a magnitude of minus 26.7, the sun is the brightest object in the sky.

1.From the song quite familiar to children, the writer wants to prove that     .

A.most stars are smaller than Jupiter

B.Jupiter is bigger and brighter than Earth

C.stars are very large and always shine brightly

D.starlight’s brightness and color are the signs of its temperature

2.Magnitude is designed to see     .

A.how far a star is from Earth

B.how bright a star is compared to other stars

C.how far a star is from other stars

D.how bright a star is seen from Earth

3.Which is the best title of this passage?

A.What do stars look like?

B.Which song do children like best?

C.How to view the stars from Earth?

D.Why are many stars so dim at night?

Answer

1.C

2.D

3.A

【解析】

本篇文章难度适中，主要讲述《小星星》这首歌中的两个误区，第一个是天空中的星星不小，很多都比地球大；第二个是它们不会发光，它们反射光。又讲述了星星的特点。

1.细节理解题。根据First, stars aren’t little. Some may be Earth-sized, but most are bigger than Jupiter, the largest planet in the solar system (太阳系). Second, they don’t twinkle; they shine可知，首先星星不小，它们不发光，它们反射光。作者想证明星星很大，总是闪闪发光，故选C。

2.细节理解题。根据Some stars appear brighter to humans simply because they’re closer. Astronomers rank (排列) the brightness of stars which are seen from Earth by giving them a name known as magnitude (光度) ---the smaller the magnitude, the brighter the object可知，天文学家把从地球上看到的星星的亮度进行排序，所以光度是用来观察从地球看到的星星有多亮。故选D。

3.主旨大意题。根据And the brightness and color of the light from each star provide information about its temperature, size and even its age可知，每个恒星发出的光的亮度和颜色提供了它的温度、大小甚至年龄的信息，所以本文主要介绍天空的星星是什么样子的。故选A。