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[主观题]
According to the passage, which of the folloving statements is true?A.Scientists have mana
According to the passage, which of the folloving statements is true?
A.Scientists have managed to know more things about asteroid 1950DA
B.Many people seem to be worried about the predicted asteroid smash.
C.Scientists are atill quite optimistic about man's future.
D.The Earth is faced with frequent threats from space.
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