It was an astonishing idea! Halley felt certain to make a prediction(预言)of what would happen in the future. He decided that this 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 had died some years before. Ever since then that comet had been called Halley’s comet, in his honor.
67.Edmund Halley figured out the orbit of ____.
A. some different comets appearing several times
B. the same comet appearing at different times
C. three different comets appearing at the same time
D. several comets appearing at the same time
68.Halley made his discovery ____.
A. by doing experiments
B. by means of his own careful observation
C. by using the working of other scientists
D. by chance
69.This passage in general is about ____.
A. Halley and other scientists
B. the orbit of a comet
C. Newton and Halley
D. Halley and his discovery
70. Which of the following is TRUE?
A. Edmund Halley was an American scientist.
B. Halley made his discovery by doing experiments.
C. Isaac Newton was a famous mathematician.
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