单项选择题

White surfaces reflect heat and light ______ black ones absorb them.

A．thus
B．whereas
C．hence
D．so
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单项选择题
Tom is now working in London and is not ______ to driving on the left.
A．served
B．customed
C．accustomed
D．using
单项选择题
The booksellers didn't want to buy all the books, ______.
A．did he
B．didn't they
C．do they
D．did they
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