单项选择题

______, electrons are still smaller.

A．As atoms small are
B．As atoms smaller as
C．Small as atoms are
D．Smaller atoms as are
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I am used ______my sleep interrupted.
A．to have
B．having
C．have
D．to having
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It is nice to go for a walk ______a summer evening.
A．on
B．during
C．in
D．at
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