单项选择题
We
derive
knowledge mainly from books.()
A. deprive
B. obtain
C. descend
D. trace
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单项选择题
She has been the subject of massive media coverage.
A. extensive
B. negative
C. expensive
D. active
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单项选择题
Theories of teaching have not been as fully developed as have theories of learning.
A．thoroughly
B．liberally
C．eagerly
D．properly
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