一、选择题:每题有3~4种选择。但只有一个选择是完全正确的,其它选择或是错误 地会使部分正确。请在完全正确的选项前划V。(每题1分) 1、e.coli DNA polymerase i具有3至5*和至3外切核酸酶活性,这两种酶活性 的区别在于: a、3至5活性只切割碱基配对处的二酯碱 b、5至3活性只切割碱基不配对处的二酯碱 c、3至5活性只切割碱基不配对处的二酯碱 d、两种活性对切割处的碱基配对与否无选择,只是5至3活性一次至切除一个核苷 酸

正规表达式和有穷自动机 1指与出正规式匹配的串 a)(abb)*c与后面的那些串匹配? ababbc abab c babc aaabc

第七章网络矩阵方程 本章主要内容 1.图的基本概念; 2.关联矩阵A,回路矩阵B,割集矩阵Q; 3.KCL矩阵形式,KVL矩阵形式; 4.节点电压方程矩阵形式; 5.回路电流方程矩阵形式; 6.割集电压方程矩阵形式; 7.列表法(2B法)介绍

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1 Background Information 2 Text Analysis 3 Lanquage Points

Text The Washwoman Background Information 1 Introduction 2 Language Points 3 Exercises

Unit 9: Petihosee Eanthe 1. Pre-Reading Activities 2. Intensive Study 3. Quiz 4. Keys

Uint10 I. Basic listening Practice 1. Script W: Many Chinese students are too shy to say anything in a classroom M: I think they dont speak because their culture values modesty, and they dont want to appear to be showing off. Goes back to Confucius

Ⅱ. Listening skills Identifying prices M: I want two correction pens and a notebook. How much are they? W: $1.95 for each correction pen. $5.00 for the notebook Q: How much does the man have to pay? 2. W: Ooh, it's only $9.8. I bet Jane would love this blue vase. Flowers are really her thing

Uints I. Basic listening practice 1. Script W: Why do some people stay in one job for life while others switch jobs from time to M: Some people want a fixed routine so that they dont have to adapt tot new circumstances over and over again, while others think variety is the spice of life Q: According to the dialog, why do some people stick to one job for life?