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题目材料：

The appearance of the star Gamma Cephei varies regularly. The existence of a planet circling a star can cause regular variation in its appearance. However, the regular variation in Gamma Cephei's appearance is no reason to think that there is a planet circling it, since the slow rotation of a star can also cause its appearance to vary regularly and ____________.

第1题

Which of the following most logically completes the argument?

A.many stars that have planets circling them rotate slowly
B.Gamma Cephei varies more in appearance than many other stars do
C.it is easier to determine the speed at which a star rotates than to determine whether a planet is circling it
D.analysis of sunspot activity on Gamma Cephei shows that it rotates slowly
E.Gamma Cephei is only one of many stars that vary regularly in appearance

D显示答案

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