单项选择题

According to the passage, which one is NOT true()

A．Newton figured out the orbit of the comet.
B．Halley figured out the orbit of the comet first.
C．Newton gave Halley some help.
D．Halley died before 1758.

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单项选择题

Edmund Halley figured out the orbit of ().

A．some different comets appearing several times
B．the same comet appearing at different time
C．three different comets appearing three times
D．several comets appearing at the same time

单项选择题

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