单项选择题

All substances, ________ , liquid or solid, are made up of atoms.

A．be they gases
B．whether they are gases
C．they are gases
D．they can be gases
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单项选择题
Where there is an earthquake, energy is ________ in one area along a crack in the earth crust.
A．repelled
B．released
C．run
D．rushed
单项选择题
I do not doubt ________ he will appear soon.
A．that
B．whether
C．if
D．whatever
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