单项选择题

Who were the first insurance contracts designed to protect

A．Pirates.
B．Sailors.
C．Manufactures.
D．Merchants.
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单项选择题
According to the author, Tolstoy’s ability to write ______.
A．had nothing to do with gift
B．was attributed to tough training
C．was a born talent
D．made him well-known
单项选择题
What Dr．Brown and his team have discovered
A．Organisms far below the Earth’s surface.
B．New drilling methods.
C．A hidden underground world.
D．Rare and infectious bacteria.
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