单项选择题

A．Find some drift wood.
B．Take some photographs.
C．Solve a mystery.
D．See the canyon.
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单项选择题
It is proved that the uncontrolled activity of free radicals caused many cancers.
A．Y
B．N
C．NG
单项选择题
A．He was a relative of the speaker’’s.B．He was a friend of the speaker’’s.C．He eventually made his way out of the building.D．He worked in the south tower of the World Trade Center.
A．He was a relative of the speaker’’s.
B．He was a friend of the speaker’’s.
C．He eventually made his way out of the building.
D．He worked in the south tower of the World Trade Center.
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