首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
职称考试
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。 Sunspots It’s not surprisi...
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。 Sunspots It’s not surprisi...
admin
2020-12-24
48
问题
下面有 3 篇短文,每篇短文后有 5 道题。请根据短文内容,为每题确定 1 个最佳选项。
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 inventiion 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.
Sunsipots 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.
Sunspots are cooler than the rest of the sun’s surface because
选项
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
A
解析
转载请注明原文地址:https://ti.zuoweng.com/ti/Y8sQKKKQ
相关试题推荐
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorintheHou...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 ADoctorinthe...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文后有2项测试任务:(1)第23~26题要求从所给的6个选项中为第1~4段每段选择1个最佳标题;(2)第27~30题要求从所给的6...
下面的短文有5处空白,短文后有6个句子,其中5个取自短文,请根据短文内容将其分别放回原有位置,以恢复文章原貌。 TheToughGrassth...
随机试题
影响房地产供给量变化的因素不包括是( )。 A、房地产开发与建设资金的来源与
小陈是病人严某的责任护士,但第一次交流就失败,请分析造成其失败的原因是( )。
根据下面资料回答: 2012年全国国内生产总值519322亿元,比上年增长7.
(2015)烟花爆竹的主要特征有:能量特征、燃烧特性、力学特性、安定性、安全性。
A.腹泻、便潜血阳性 B.腹痛伴腹胀 C.腹痛、腹泻,排便后腹痛缓解 D.
预控性处置可由()完成。A.信贷审批部门B.信贷发放部门C.风险预警部门D.风险决策部门E.预控对策系统
银行业从业人员的下列行为中,不符合“熟知业务”的有关规定的是()。A.熟知向客户推荐的产品B.银行产品部门向客户经理介绍产品时未提及风险,客户经理也没有主动
Themeeting__________inthehalltomorrowisaboutenvironmentprotection.A.isb
经审核,家庭收入、家庭住房状况符合规定条件的,由建设(住房保障)主管部门予以公示,公示期限为()。A.5日B.10日C.15日D.25日
下列选项中,关于应届毕业生与一般员工在录用工作中表现出来的差别,正确的是()。A.应届毕业生职业发展困惑程度不同于一般员工B.一般员工对公司期望和要求