问题
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What did the researchers discover in northern Kenya?A.A human tooth.B.A human skull.C.Thre
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The cave might never have been discovered ______ by the distinguished French potholer, Ber
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According to the professor, what have the researchers agreed on?A.The rocks cannot move af
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The doctors discover will have a ______ effect on mankind.A.extremeB.radicalC.excessiveD.p
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Astronomers have discovered what may be five planets orbiting Tau Ceti, the closest singl
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Dr. Harvey Gates, the noted scientist, might never have discovered the Kamron lizard (蜥蜴
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