单项选择题

Every human being, no matter what he is doing, ______ body heat.

A．keeps up
B．puts off
C．takes in
D．gives off
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单项选择题
If you spare half an hour each day to read an English newspaper, you will surely be able to read______.
A．efficiently
B．sufficiently
C．actually
D．purposefully
单项选择题
The harder they worked,______.
A．they seemed to do less
B．the less they seemed to do
C．less they seemed to do
D．they did less
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