单项选择题

Which of the following is NOT MENTIONED in the passage（）

A．Gunpowder.
B．Needles.
C．Paddle boats.
D．Bridge design.

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So far, how many volumes of the book have been published（）

A．Five.
B．Four.
C．Three.
D．None.
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The best title for this passage is（）

A．China's Inventions
B．China Is Catching Up
C．Comparisons Between the East and the West
D．Situations in China
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