第 1 题 · 四级
The new system uses a lower voltage, which makes it safer for home use.
核心词：voltage ˈvəʊltɪdʒ n. 电压
新系统使用更低电压，家用更安全。
一般现在时主谓宾 + which 从句 + make sth safer短语 low voltage短语 output voltage
The new system uses a lower ___, which makes it safer for home use.
第 2 题 · 四级
The video contains both audio and visual parts, which the teacher played in class.
核心词：audio ˈɔːdiəʊ adj. 声音的，音频的
视频既含音频也含画面，老师在课堂上播放了它。
一般过去时主谓宾 + both…and… + which 从句短语 audio equipment短语 an audio file
The video contains both ___ and visual parts, which the teacher played in class.
第 3 题 · 四级
The course gives students more breadth of knowledge, which the school values highly.
核心词：breadth bredθ n. 宽度，幅度
这门课拓宽学生的知识面，学校非常重视。
一般现在时give sb sth + 介词短语 + which 从句短语 breadth of knowledge短语 breadth of mind
The course gives students more ___ of knowledge, which the school values highly.
