单项选择题
Plants with roots appeared about ______ million years ago.
A.430
B.300
C.330
D.100
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单项选择题
A.gladB.unluckyC.luckyD.astonished
A.glad
B.unlucky
C.lucky
D.astonished
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单项选择题
A.outB.awayC.at onceD.along
A.out
B.away
C.at once
D.along
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