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
By 2005 the population of our country ______ 13 millions.
A．will number
B．will be numbered
C．will have been numbered
D．will have numbered
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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