单项选择题

Some studies confirmed that this kind of eye disease was（）in tropical countries.

A. prospective
B. prevalent
C. provocative
D. perpetual

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单项选择题

Much（）I have traveled, I have never seen anyone to equal her for thoroughness, whatever the job

A．when
B．more
C．farther
D．as

单项选择题

Prepaid college tuition is generally designed on the principle that（）

A. it is easy to pay at the present time
B. it is economical in the long nm
C. is saves pains to pass the entrance exam
D. it ensures the admission to the college