单项选择题

U.
S. President urged the
U.
S. Congress to play a key role in the fight against ______ in Africa.

A. starvation
B. AIDS
C. discrimination
D. unemployment

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单项选择题People did not begin to use unmanned vehicles in undersea exploration until recently because of______.

单项选择题D

U.S. President urged the U.S. Congress to play a key role in the fight against ______ in Africa. 您的浏览器不支持 audio 元素。