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 o{ 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
If the author's assessment of the use of heat pumps is correct, which of the following best expresses the les,son 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.
单项选择题
The primary purpose of the passage is to ________.
A．explain the differences in the working of a heat pump when the outdoor temperature changes
B．contrast the heating and the cooling modes of heat pumps
C．describe heat pumps, their use, and factors affecting their use
D．advocate the more widespread use of heat pumps
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