单项选择题

New York City collects garbage ________ $209 per family per year.

A．at the cost of
B．at sacrifice of
C．in demand of
D． in support of
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单项选择题
Essentially, a theory is an abstract, symbolic representation of ________ reality.
A．what it is conceived
B． that is conceived
C．what is conceived to be
D．that is being conceived of
单项选择题
Why do the Israeli forces threaten to carry out a massive offensive against the Palestinians
A．Because Israeli troops were besieged by the Palestinians.
B．Because the military operation began since last November.
C．Because Palestinians killed Israelis in a suicide attack.
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