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
Franklin D. Roosevelt argued that the depression stemmed from the American economy's （）flaws.

A．underlining
B．vulnerable
C．vulgar
D．underlying
单项选择题
His （）directions confused us; we did not know which of the two roads to take.

A．ambiguous
B．complicated
C．arbitrary
D．intricate
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