Considering how difficult it is to prove or disprove the existenc

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Considering how difficult it is to prove or disprove the existence of life on Mars, which is practically our neighbor, it is quite _____ challenge to do the same for any Earthlike planets that might exist outside our solar system.

A、a formidable
B、an impossible
C、a hopeless
D、a daunting
E、an urgent
F、an immediate

答案：A,D

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