单项选择题

According to the NAS's report, one of the problems in end-of-life care is ________.

A．prolonged medical procedures
B．inadequate treatment of pain
C．systematic drug abuse
D．insufficient hospital care
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单项选择题
The author regards the notion that heat pumps have a genuine drawback as a ________.
A．cause for regret
B．sign of premature defeatism
C．welcome challenge
D．focus for an educational campaign
单项选择题
It can be inferred from the passage that, in the course of a heating season, the heating capacity of a heat pump is greatest when ________.
A．heating is least essential
B．electricity rates are lowest
C．its compressor runs the fastest
D．outdoor temperatures hold steady'
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