单项选择题

The author was required to submit an （） of about 200 words together with his research paper.

A．edition
B．editorial
C．article
D．abstract

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单项选择题
So far, （） winds and currents have kept the thick patch of oil southeast of the Atlantic coast.

A．governing
B．blowing
C．prevailing
D．ruling
单项选择题
His trousers （） when he tried to jump over the fence.

A．cracked
B．split
C．broke
D．burst
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