单选题:The experiment has______________ the possibility of the exis

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题目内容:
The experiment has______________ the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.
A.found out
B.pointed out
C.ruled out
D.carried out
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相同提及、相同pH的某一元强酸溶液①和某一元中强酸溶液②分别与足量的锌粉发生反应,下列关于氢气体积(V)随时间(t)变化的示意图正确的是

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