单项选择题

The clumsy movement of the giant panda amused all the ______.

A．visitors
B．witnesses
C．watchers
D．spectators
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单项选择题
The invisible rays of the ______ beyond the violet end are called the ultraviolet rays.
A．speculation
B．spectrum
C．sleet
D．range
单项选择题
In his ______ to further his knowledge of the universe, man has now begun to explore space.
A．endeavor
B．expedition
C．trail
D．chase
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