This seemed very strange to Halley.The different comets followed the same orbit.The more Halley thought about it, the more he thought that there had not been three different comets, as people thought.He decided that they had simply seen the same comet three times.The comet had gone away and had come back again.

　　It was an astonishing idea! Halley felt certain enough to make a prediction (预言) of what comet would happen in the future.He decided that this comet would appear in the year 1758.There were 53 years to go before Halley's prediction could be tested.In 1758 the comet appeared in the sky.Halley did not see it, for he has died some years before.Ever since then that comet has been called Halley's comet, in his honor.

　　1．Halley made his discovery ________.

　　A．by doing experiments

　　B．by means of his own careful observation

　　C．by using the work of other scientists

　　D．by chance

　　解析：选C。细节理解题。由文中第三段得知。

　　2．Halley made a surprising, but correct prediction in the year ________.

　　A．1704

　　B．1705

　　C．1706

　　D．1707

　　解析：选B。计算题。文中的“He decided that this comet would appear in the year 1758.There were 53 years to go before Halley's prediction could be tested.”这句话告诉我们：他预言彗星出现的时间是1758年，而这个预言还要经过53年才能验证，由此可以推断出哈雷做出这个预言的时间是1705年。

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