单项选择题

Mr. Li is the present ______ of the presidential chair of the company.

A．transaction
B．prescription
C．professor
D．incumbent
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单项选择题
Agreement made by the President with other countries ______ the approval of the Senate.
A．is subjected to
B．is subject to
C．draws out
D．substitute for
单项选择题
The economy is showing signs of ______.
A．halting
B．overflowing
C．outbreaking
D．faltering
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