1.是oc上的吧!答案是去掉also这里also是连词与and重复.they这里只能指plants,signal是不可能mount their own defenses.
2.①分号跟完整句子,这个不完整的
②exist是持久性动词无进行时
3.比较不对等 后面应该是take temporary jobs like now
积累rp中,保佑我cr上600 oct 9th
sat 语法题Some plants use chemical signals that repel insects,a
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