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Sunspots are cooler than the rest of the sun's surface because
A．they produce less energy.
B．they are buried in the sun.
C．they are far away from magnetic fields.
D．they are close to magnetic fields.
答案
更多“Sunspots are cooler than the rest of the sun's surface becauseA．they produce less energy.B”相关的问题
第1题
42 Sunspots are cooler than the rest of the sun' s surface because
A they produce less energy．
B they are buried in the sun．
C they are far away from magnetic fields．
D they are close to magnetic fields．
第2题
Sunspots
It's not surprising that sunspots (太阳黑子) were observed by ancient astronomers (天文学家). The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.
Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun's surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field, spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun's surface.
Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转).
The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.
The average lifetime of an individual spot group is roughly one solar rotation, which is about 25 days. The most persistent large spots, however, can survive for two to three months.
Careful observations and systematic studies of sunspots
A．were made by ancient astronomers.
B．started in the early 17th century.
C．were made by Galileo only.
D．could be made without a telescope.
第3题
第三篇
Sunspots
It's not surprising that sunspots（太阳黑子）were observed by ancient astronomers（天文学家）．The largest sunspots on the sun can be seen without a telescope．1t was not until the invention of the telescope（望远镜）in the early l7th century，however，that systematic studies of sunspots could be undertaken．The great astronomer Galileo was among the first to make telescopic observations of sunspots．
Sunspots are regions of extremely strong magnetic fields（磁场）found on the sun's surface．A sunspot has a dark central core known as the umbra．The umbra is surrounded by a dark ring called the penumbra．where the magnetic field spreads outward．Sunspots appear dark because they are giving off less radiation．They are cooler than the rest of the sun's surface．
Sunspots are frequently observed in pairs or in paired groups．The members of a spot pair are identified as the leading spot and the following spot．They are identified by their position In the pair In terms of the direction in which the sun rotates（旋转）．
The number of sunspots at any one time varies．A large spot group may consist of as many as 10 groups and 300 spots across the sun．The number of spots changes in a fairly regular pattern called the sunspot cycle．The largest number occurs about every 11 years．At sunspot minimum, there are at most just a few small spots．
The average lifetime of an individual spot group is roughly one solar rotation．which is about 25 days．The most persistent large spots, however, can survive for two to three months．
41 Careful observations and systematic studies of sunspots
A were made by ancient astronomers．
B started in the early 17th century．
C were made by Galileo only．
D could be made without a telescope．
第4题
请根据短文内容，回答题。
Sunspots （太阳黑子）
It&39;s not surprising that sunspots were observed by ancient astronomers (天文学家) . The largest sunspots on the sun can be seen without a telescope. It was not until the invention of the telescope (望远镜) in the early 17th century, however, that systematic studies of sunspots could be undertaken. The great astronomer Galileo was among the first to make telescopic observations of sunspots.＜br＞
Sunspots are regions of extremely strong magnetic fields (磁场) found on the sun&39;s surface. A sunspot has a dark central core known as the umbra. The umbra is surrounded by a dark ring called the penumbra, where the magnetic field spreads outward. Sunspots appear dark because they are giving off less radiation. They are cooler than the rest of the sun&39;s surface.＜br＞
Sunspots are frequently observed in pairs or in paired groups. The members of a spot pair are identified as the leading spot and the following spot. They are identified by their position in the pair in terms of the direction in which the sun rotates (旋转) .＜br＞
The number of sunspots at any one time varies. A large spot group may consist of as many as 10 groups and 300 spots across the sun. The number of spots changes in a fairly regular pattern called the sunspot cycle. The largest number occurs about every 11 years. At sunspot minimum, there are at most just a few small spots.＜br＞
The average lifetime of an individual spot group is roughly one solar rotation, which is about25 days. The most persistent large spots, however, can survive for two to three months.
Careful observations and systematic studies of sunspots __________. 查看材料
A.were made by ancient astronomers
B.started in the early 17th century
C.were made by Galileo only
D.could be made without a telescope
第5题
Why does the author mention "blemish," in paragraph 4？
A．To suggest that sunspots are flaws on the surface of the sun.
B．To illustrate that the sun is thought to have a face.
C．To emphasize that sunspots are indicative of illness.
D．To explain that microscopes are strong enough to see sunspots.
第6题
A．undetermined
B．insignificant
C．unusual
D．indisputable
第7题
The passage is mainly concerned with______.
A．the components of sunspots
B．sunspots acting like planet-sized hurricanes
C．a better understand of the sun
D．sunspots and the hurricanes
第8题
根据下列材料请回答 41～45 题：
第 41 题 Careful observations and systematic studies of sunspots
第9题
The desert is full of activities in summer nights because ______.
A．it is cooler and safer for most animals at night
B．animals can find food in the dark
C．it is easy for animals to find water at night
D．animals cannot sleep at night
第10题
A．T
B．F
C．NG
