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题库 / OG2015V-SC-34
Lacking information about energy use, people tend to overestimate the amount of energy used by equipment, such as lights, that are visible and must be turned on and off and underestimate that used by unobtrusive equipment, such as water heaters.
equipment, such as lights, that are visible and must be turned on and off and underestimate that
equipment, such as lights, that are visible and must be turned on and off and underestimate it when
equipment, such as lights, that is visible and must be turned on and off and underestimate it when
visible equipment, such as lights, that must be turned on and off and underestimate that
visible equipment, such as lights, that must be turned on and off and underestimate it when
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equipment 是单数，用is， 不能用are。--排除A
A/D的that指代the amount of energy，that/where/who等可以指代一个特定的名词也可以指代复合名词整体。
B/C/E的it指代the amount of energy used by visible equipment，错误。it/they完整指代整个复合名词。
A/D的that指代the amount of energy，that/where/who等可以指代一个特定的名词也可以指代复合名词整体。
B/C/E的it指代the amount of energy used by visible equipment，错误。it/they完整指代整个复合名词。
是的，that作为限制性定语前面不能加逗号，除非有插入语。所以这里只能修饰equipment，不能修饰lights登录 或 注册 后可以参加讨论
rc
考查：
未画线部分平行，单复数；
1. lights是light的复数形式
2. 未画线部分used by unobtrusive equipment和前面used by visible equipment平行
3. that指代的是the amount of energy
Visible equipment表达清晰，说明人容易意识到照明类电器的用电，如果按照ABC的表达，那么删除掉定于部分，意思就不清楚了。
E：when放在这里不合适，这里是要做两类电器的用电量，that指代the amount of energy