第 1 题 · 高考
Human beings need clean air and water, because they are the basis of life.
核心词：being ˈbiːɪŋ n. 生物，人
人类需要干净的空气和水，因为它们是生命的基础。
一般现在时原因状语从句短语 human beings短语 a living being
Human ___ need clean air and water, because they are the basis of life.
第 2 题 · 高考
Each person has a unique fingerprint, which makes it easy to tell people apart.
核心词：unique juˈniːk adj. 独特的，唯一的
每个人都有独特的指纹，这让人很容易区分。
一般现在时which 非限制性定语从句短语 a unique fingerprint短语 tell...apart
Each person has a ___ fingerprint, which makes it easy to tell people apart.
第 3 题 · 高考
The user should read the instructions first, before using the new machine.
核心词：user ˈjuːzə n. 使用者，用户
使用者在使用新机器前应先阅读说明书。
一般现在时before + 动名词短语 the user of短语 read the instructions
The ___ should read the instructions first, before using the new machine.
