单项选择题

After briefly ______ the history of the author, Prof. Li turtles to the novel itself immediately.

A．dipping in
B．dipping at
C．dipping into
D．dipping to
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单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
单项选择题
A body weighs ______ from the surface of the Earth.
A．less the farther it gets
B．the farther it gets, the less
C．less than it gets farther
D．less than it, the farther it gets
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