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检测·课时达标
【基础巩固】
Ⅰ. 单词拼写
1. The ________ (受伤)to their key player could lead to their losing the game.
2. Some people say that selfishness is a ________ (毒害)in our society.
3. Generally speaking, the crime rate is one of the ________ (症状) of social unrest(不安定).
4. The old man almost ________ (窒息)to death in the thick smoke.
5. The mountains form a natural ________ (屏障)between the two countries.
6. To the teacher’s surprise, the boy worked out such a ________ (复杂的) math
