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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grammar and vocabulary
单项选择题
People did not begin to use unmanned vehicles in undersea exploration until recently because of______.
A. the communication problem
B. the movement of waves
C. the ocean depths
D. the problem of vacuum
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