The solution, if that is the case, is to install a pressure-reducing ______ on the water system.

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问题 The solution, if that is the case, is to install a pressure-reducing ______ on the water system.

选项 A、shaft
B、shelf
C、axis
D、valve

答案D

解析 名词辨义。这四个选项的词性都是名词,其中shaft表示“斧柄,槌柄;高尔夫球棒;车辕,车杠;机械轴”,shelf是指“架子;搁板”,如:book shelf(书架)。axis表示“轴;轴线”,valve表示“阀;活门;气门”。根据句意,供水系统上应该装一个减压阀,应该选择D)。
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