单项选择题

No national park was built in the Great Basin for a long time because_______.

A．it is far from any city
B．some considers it harmful in some way
C．the place was found not long ago
D．the weather was bad there
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单项选择题
Lehman Caves are______.
A．about a kilometre each
B．separated from each other
C．rooms made of limestone
D．what interest visitors most
单项选择题
The main purpose of this text is to_________.
A．tell students of important schedule changes
B．tell students of new bus and library services
C．show the excellent services for students
D．ask students to renew their library cards
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