英语六级
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.
细节题。教授提到At that time this seemed unbelievable fast and efficient.即“那个时候,快速帆船有着难以置信的速度和效率”。因此,正确答案为B。
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