单项选择题

No sooner had the man departed than the tree began dropping coffee beans ______.

A．by the thousand
B．by thousands
C．in thousand
D．of thousands
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单项选择题
Her ______ to executive manager is an acknowledgement of her hard work and unusual talent.
A．profession
B．occupation
C．resignation
D．promotion
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
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