单项选择题

From its experience, the dog found that （）

A．only the paper with Mrs. Smith's words on it could bring it meat
B．the butcher would give the meat to it whenever he saw it
C．a piece of paper could bring it half a pound of meat
D．Mrs. Smith would pay for the meat it got from the butcher

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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.

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