第 1 题 · 六级
The snake let out a sharp hiss, which the careful hiker has heard from a distance.
核心词：hiss hɪs n./v. 嘶嘶声
蛇发出尖锐的嘶嘶声，谨慎的徒步者从远处就听到了。
现在完成时主谓 + 短语动词 + 定语 + which 从句（现在完成 + from）短语 let out a hiss短语 hiss at
The snake let out a sharp ___, which the careful hiker has heard from a distance.
第 2 题 · 六级
The plane shook in the turbulence, which the nervous passengers have never experienced before.
核心词：turbulence ˈtɜːbjələns n. 骚乱，气流
飞机在气流中颠簸，紧张的乘客们从未经历过。
现在完成时主谓 + 介词短语 + which 从句（现在完成否定 + before）短语 air turbulence短语 political turbulence
The plane shook in the ___, which the nervous passengers have never experienced before.
第 3 题 · 六级
The rider held the reins tightly, which the wild horse has tried hard to break free from.
核心词：rein reɪn n. 缰绳；v. 控制
骑手紧紧握住缰绳，野马拼命想挣脱。
现在完成时主谓宾 + 副词 + which 从句（现在完成 + try to + break free）短语 hold the reins短语 rein in
The rider held the ___ tightly, which the wild horse has tried hard to break free from.
