单项选择题

Dr. Hawking has made much contribution to the theories of modem physics at the ______ of his health.

A．cost
B．disposal
C．mercy
D．expenditure
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单项选择题
John Smith, being a diligent student, never refuses to ______ more responsibilities that are assigned to him.
A．take up
B．take in
C．take off
D．take on
单项选择题
The Mona Lisa, ______ in Italy, is now in the Louvre, a museum in Paris.
A．who painted
B．who has painted
C．which painted
D．which was painted
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