第 1 题 · 六级
The colour red is often used to signify danger, which drivers understand without being told.
核心词：signify ˈsɪɡnɪfaɪ v. 表明，象征
红色常被用来表示危险，司机们无需被告知就能明白。
一般现在时被动语态 + 副词 + 目的不定式 + which 从句 + without being told短语 signify danger短语 signify a change
The colour red is often used to ___ danger, which drivers understand without being told.
第 2 题 · 六级
The city is at an elevation of two thousand metres, which the climbers had prepared well for.
核心词：elevation ˌelɪˈveɪʃn n. 高度，海拔
这座城市海拔两千米，登山者们为此做了充分准备。
过去完成时主系表 + 介词短语 + which 从句（过去完成 + prepare for）短语 at an elevation of短语 a high elevation
The city is at an ___ of two thousand metres, which the climbers had prepared well for.
第 3 题 · 六级
Reading widely will broaden your mind, which the teacher always tells her students.
核心词：broaden ˈbrɔːdn v. 放宽，变宽
广泛阅读会开阔你的眼界，老师总是这样告诉她的学生。
一般将来时动名词主语 + 一般将来时 + which 从句短语 broaden one’s mind短语 broaden the horizon
Reading widely will ___ your mind, which the teacher always tells her students.
