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

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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

单项选择题

Certain species disappeared or became （）as new forms arose that were better adapted to the Earth's changing environment.

A．feeble
B．extinct
C．massive
D．extinguished

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