第 1 题 · 高考
She knocked on the door lightly, and then waited quietly.
核心词：lightly ˈlaɪtlɪ adv. 轻轻地
她轻轻地敲门，然后静静地等待。
一般过去时knock lightly短语 lightly touch
She knocked on the door ___, and then waited quietly.
第 2 题 · 高考
Only a small fraction of the students passed the test, so the teacher was worried.
核心词：fraction ˈfrækʃ(ə)n n. 小部分；分数
只有一小部分学生通过了测试，老师很担心。
一般过去时a fraction of短语 a fraction of
Only a small ___ of the students passed the test, so the teacher was worried.
第 3 题 · 高考
Biological research helps us fight disease, and it saves many lives.
核心词：biological ˌbaɪəˈlɒdʒɪkl adj. 生物的
生物研究帮助我们对抗疾病，挽救了无数生命。
一般现在时biological research短语 biological process
___ research helps us fight disease, and it saves many lives.
