单选题
It can be inferred form the passage that ______.
A、
(A) there was once a wave of Mars exploration by scientists.
B、
(B) life has existed on Mars.
C、
(C) Lowell's claim is proved incorrect today.
D、
(D) It's a waste of time to try to answer the question concerning life on Mars.
【正确答案】
A
【答案解析】
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