题目:
根据句意和所给中文写出句中所缺的单词.
1. May I _____ (介绍) my best friend Amy to you, Sandy?
2. I think it's our _____ (职责) to protect the environment.
3. The cinema has _____ (出口) on its three sides.
4. Will you please pay _____ (注意力) to what I am saying?
5. How many _____ (客人) were there in yesterday's party?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B解析:本题主要考核考生对水解DNA多种酶的异同及限制性内切核酸酶概念的理解。所谓限制性内切核酸酶就是指识别DNA的特异序列,并在识别位点或其周围切割双链DNA的一类内切酶。通常不用非限制性内切核...