There might be life on other planets, but so far scientists haven't found enough to prove it.
A. evidence
B. relic
C. mystery
D. reception
网友回答
(答案→)A. evidence
B. relic
C. mystery
D. reception
解析：名词词义辨析。A证据；B遗址，遗迹；C秘密，谜；D接待，欢迎；句意：在其它的星球上也许又生命，但是到目前为止科学家们还没有找到足够的证据来证明这一点。故A正确。