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though unless provided until
人体中酶的活性受温度、pH的影响，并只能在人体的内环境中起作用 酶的形成都要经过核糖体的合成、内质网和高尔基体的加工等几个阶段 与光合作用有关的酶分布在类囊体薄膜上和叶绿体基质中 酶均是由腺细胞合成的，具有高效性、专一性
can’t mustn’t shouldn’t wouldn’t
service；probable suggestion；possible offer；likely proposal；perhaps
Will you? Why not? I hope so. I’m afraid not.
serious polluted the lake is serious polluted is the lake seriously polluted is the lake seriously polluted the lake is
No problem Be my guest With pleasure Not at all
As you like By all means As a result Believe it or not
alternatively differently relatively oppositely
① ② ④ ② ③ ④ ① ② ③ ① ② ③ ④
各国经济依赖性加强 各国面对同样的经济规则 各国共享市场和各种资源 发达国家开采发展中国家的资源
led；as well as was in lead； as good as was in the lead； as well as took the lead； as good as
坊和市的界限被打破 经营时间限制被打破
官府不监督交易活动 经营活动是八方辐辏
How was it that When was it that Why was it that What was it that
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