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

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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大学英语六级

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