【題目】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

【答案】A
【解析】A.evidence證據(jù)；B.character人物；C.mystery謎；D.expression表達(dá)；句意：外星球上可能有生命存在，但迄今為止，科學(xué)家還沒找到足夠的證據(jù)證明這一點(diǎn)。根據(jù)句意，故選A。

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