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  3. Edmund Halley figured out the orbit of ______. Halley made his discovery ______.

Edmund Halley figured out the orbit of ______. Halley made his discovery ______.

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问题 Edmund Halley figured out the orbit of ______.
Halley made his discovery ______.
选项 A、by doing experiments
B、by means of his own careful observation
C、by using the work of other scientists
D、by chance
答案C
解析 本题属对细节信息的深层理解推断题。其关键词是made．．，discovery。Halley的discovery是基于对comets that had been observed by scientists(第3段)进行的计算，即(C)by u sing the work of other scientists才得来的。而不是通过(A)实验、(B)仔细观察、或(D)偶然才发现的。
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