单项选择题

Questions 21 to 23 are based on the following news.
Pirates’ motherships usually

A. are as large as small motor boats.
B. are built by themselves.
C. carry supplies and fuel.
D. sail close to patrolled coastline.

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单项选择题

Questions 21 to 23 are based on the following news. Pirates’ motherships usually 您的浏览器不支持 audio 元素。