单项选择题
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A.Why species don’t avoid extinction by adapting.
B.Why species become extinct at the rate they do.
C.Why humans aren’t extinct.
D.How many species aren’t extinct.
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单项选择题
A.They carried passengers, but not cargo.B.They were large, but surprisingly fast.C.They were the first successful steam-powered ships.D.They were more reliable than other ships of the 1860’s.
A.They carried passengers, but not cargo.
B.They were large, but surprisingly fast.
C.They were the first successful steam-powered ships.
D.They were more reliable than other ships of the 1860’s.
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F
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