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

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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
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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