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The (i)_____ of molecular oxygen on Earth-sized planets around other stars in the universe would not be (ii)_____ sign of life: molecular oxygen can be a signature of photosynthesis (a biotic process) or merely of the rapid escape of water from the upper reaches of a planetary atmosphere (an abiotic process).
Blank(i)Blank(ii)
A、dearthD、a controversial
B、presumptionE、an unambiguous
C、detectionF、a possible
答案:C,E

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