单项选择题

While he was in Beijing, he spent all his time __________ some important museums and buildings.

A．visiting
B．traveling
C．watching
D．touring
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单项选择题
Rite of Passage is a good novel by any standards;__________, it should rank high on any list of science fiction.
A．consistently
B．consequently
C．invariably
D．fortunately
单项选择题
The diversity of tropical plants in the region represents a seemingly __________ source of raw materials, of which only a few have been utilized.
A．exploited
B．controversial
C．inexhaustible
D．remarkable
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