单项选择题

Which of the following is not true of the sun spots（）

A．They are caused by the magnetic pull from inside the sun.
B．They are areas of high- level magnetism.
C．They are actually black holes in the sun.
D．They reach their peak in a cycle of 11 years.

<上一题目录下一题>

热门试题

单项选择题

Which of following is the best title for the passage（）

A．Fluctuations in Weather Patterns.
B．Magnetism and the Sun Spots.
C．The Size and Number about the Earth' s.
D．Livingston' s New Theory about the Earth' s Climat

单项选择题

Which of the following is true of Livingston（）

A．He thinks he has discovered a new possibility in the link between sun spots and the weather on the Earth.
B．He has great doubts about the theory that the sun' s frequent changes have an influenced on the Earth' s climate.
C．He has been recently informed by other scientists of the possibility that more sun spots will appear.
D．He does not think the causes of the sun spots will be fully revealed by scientists in the near futur