单项选择题

Effective prevention against physical harms has never been （）urgently needed, especially in schools.

A．more
B．as
C．such
D．quite

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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
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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