问题补充:
Many scientists have believed that there may be a of life on the Mar.
A. mark
B. signal
C. sigh
D. sign
答案:
A. mark
B. signal
C. sigh
(答案→)D. sign
解析:考查名词辨析:A. mark记号,B. signal信号,C. sigh叹息,D. sign标志,迹象,句意是:很多科学家一致相信在火星上可能有生命的迹象。选D。
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