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Passage3Ifwelookatthenightskycarefully,wewillseethatmanyofthestarsarecolored.Somearer...
Passage 3
If we look at the night sky carefully, we will see that many of the starsare colored. Some are red, others are yellow and some are even blue.
This
is also shown when we photograph part of the night sky in color. You can take
such a photograph with an ordinary camera so long as it is kept steady. A
30-second exposure is sufficient.
Astronomers
have been able to classify stars according to color. They have found that blue
stars are the largest and red stars the smallest. However, there are a few
stars which cannot be classified in this way. These are the super stars. For
example, Rigel is a super blue star as big as 40,000 suns Betelgeuse is a super
red star with a size equal to 17,000 suns.
Suppose
an astronomer observes two stars, one brighter than the other. If neither of
them is a super star, he will know immediately that the brighter star is
closer. Astronomers have instruments like light meters which can measure the
brightness of a star quite accurately. Once they know the color, the
brightness, and whether or not it is a super star, it is possible to measure
its distance from the earth.
1. Which of the following kinds of colored stars is not menti0oned?
A. Blue stars B. Red stars C. Green stars D. Yellow stars
2. How can we successfully use an ordinarycamera to photograph the night sky in color?
A. We must first of all look at thenight sky carefully.
B. We should first use light meters tomeasure the brightness of stars.
C. We must know beforehand the distanceof the stars from the earth.
D. We should keep it steady and use a30-second exposure.
3. How have astronomers been able to classifystars?
A. According to color.
B. By careful observation.
C. According to brightness.
D. By determining whether or not theyare super stars.
4. What kind 0f star is Betelgeuse?
A. It is an ordinary star as big as thesun.
B. It is a super red star much biggerthan the sun.
C. It is an ordinary blue star as big as17,000 suns.
D. It is a super yellow star as big as40,000 suns.
5. Which of the following is NOT necessary
for astronomers to know in order to measure the distance between a star and the
earth?
A. The brightness of the star.
B. The size of the star
C. The color of the star.
D. The knowledge of whether or not it isa super star. 展开
If we look at the night sky carefully, we will see that many of the starsare colored. Some are red, others are yellow and some are even blue.
This
is also shown when we photograph part of the night sky in color. You can take
such a photograph with an ordinary camera so long as it is kept steady. A
30-second exposure is sufficient.
Astronomers
have been able to classify stars according to color. They have found that blue
stars are the largest and red stars the smallest. However, there are a few
stars which cannot be classified in this way. These are the super stars. For
example, Rigel is a super blue star as big as 40,000 suns Betelgeuse is a super
red star with a size equal to 17,000 suns.
Suppose
an astronomer observes two stars, one brighter than the other. If neither of
them is a super star, he will know immediately that the brighter star is
closer. Astronomers have instruments like light meters which can measure the
brightness of a star quite accurately. Once they know the color, the
brightness, and whether or not it is a super star, it is possible to measure
its distance from the earth.
1. Which of the following kinds of colored stars is not menti0oned?
A. Blue stars B. Red stars C. Green stars D. Yellow stars
2. How can we successfully use an ordinarycamera to photograph the night sky in color?
A. We must first of all look at thenight sky carefully.
B. We should first use light meters tomeasure the brightness of stars.
C. We must know beforehand the distanceof the stars from the earth.
D. We should keep it steady and use a30-second exposure.
3. How have astronomers been able to classifystars?
A. According to color.
B. By careful observation.
C. According to brightness.
D. By determining whether or not theyare super stars.
4. What kind 0f star is Betelgeuse?
A. It is an ordinary star as big as thesun.
B. It is a super red star much biggerthan the sun.
C. It is an ordinary blue star as big as17,000 suns.
D. It is a super yellow star as big as40,000 suns.
5. Which of the following is NOT necessary
for astronomers to know in order to measure the distance between a star and the
earth?
A. The brightness of the star.
B. The size of the star
C. The color of the star.
D. The knowledge of whether or not it isa super star. 展开
3个回答
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第1 题选 C . Green stars ，在第一段Some are red, others are yellow and some are even blue.有红色，黄色和蓝色，没有提到绿色，所以选C
第2 题选D 提示在第二段You can take such a photograph with an ordinary camera so long as it is kept steady. A 30-second exposure is sufficient.
第3 题选A According to color，根据颜色来分类，提示关键句为第三段第一句Astronomers
have been able to classify stars according to color.
第4 题选B 在原文中的Betelgeuse is a super red star with a size equal to 17,000 suns.
第5题选B ，其余三个都是测量距离的根据，原文最后一句Once they know the color, the
brightness, and whether or not it is a super star, it is possible to measure its distance from the earth.，没有提到星星的体积，所以选B。
很用心做的，请及时采纳哦，o(∩_∩)o
第2 题选D 提示在第二段You can take such a photograph with an ordinary camera so long as it is kept steady. A 30-second exposure is sufficient.
第3 题选A According to color，根据颜色来分类，提示关键句为第三段第一句Astronomers
have been able to classify stars according to color.
第4 题选B 在原文中的Betelgeuse is a super red star with a size equal to 17,000 suns.
第5题选B ，其余三个都是测量距离的根据，原文最后一句Once they know the color, the
brightness, and whether or not it is a super star, it is possible to measure its distance from the earth.，没有提到星星的体积，所以选B。
很用心做的，请及时采纳哦，o(∩_∩)o
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