【題目】—______can sharks swim?
—39 km per hour.

A.How often
B.How fast
C.How much
D.How long

【答案】B
【解析】句意：鯊魚可以游得多快？每小時(shí)39千米。根據(jù)答語可知，問句應(yīng)問鯊魚的速度。故選B。

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