Question

【题目】There may be life on other planets，but so far scientists haven't found enough ______ to prove it.
A.evidence
B.character
C.mystery
D.expression

Answer 1

【答案】A
【解析】A.evidence证据；B.character人物；C.mystery谜；D.expression表达；句意：外星球上可能有生命存在，但迄今为止，科学家还没找到足够的证据证明这一点。根据句意，故选A。