单项选择题

Enormous sums of money have been spent on space exploration.()

A. Much
B. Large
C. Small
D. Fixed

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单项选择题

Located in Washington, D. C. , the Library of Congress contains an imposing array of books on every conceivable subject.()

A.history
B. catalog
C. shelf
D. collection

单项选择题

It is said the houses aidng this street will soon be demolishe()

A. pulled down
B.pulled up
C. pulled off
D. pulled in

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