单项选择题

According to the passage, the role of the flow restriction in a heat pump is to______

A．measure accurately the flow rate of the refrigerant-mass at that point
B．compress and heat the refrigerant vapor
C．bring about the evaporation and cooling of refrigerant
D．exchange heat between the refrigerant and the air at that point
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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
If the author's assessment of the use of heat pumps is correct, which of the following best expresses the lesson that advertisers should learn from this case______
A．Do not make exaggerated claims about the products you are trying to promote.
B．Focus your advertising campaign on vague analogies and veiled implications instead of on facts.
C．Do not use facts in your advertising that will strain the prospective client's ability' to believe.
D．Do not assume in your advertising that the prospective clients know even the most elementary scientific principles.
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