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：句意：在其他星球可能有生命，但是到目前为止科学家没有找到足够的证据证明。Evidence证据；relic遗迹；mystery秘密；reception接待，选A。