一、今年是DNA双螺旋模型发表五十周年。请回答以下问题(20分): 1、在双链DNA分子中A+T+C是否等于A+CG+T?(4分) 2、DNA双链的两条链中是否含有相同的遗传信息?为什么?(4分)

人教A版高中数学必修4第二章 平面向量2.1 平面向量的实际背景及基本概念习题(1)

Example 1.6. Consider the graph y(x) cos(x) over [0.0, 1.2]. (a) Use the nodes xo=0.0andx1=1.2 to construct linear interpolating polynomial Pi(). (b)Use the nodes xo 0.2 and x =1.0 to construct a linear approximating polynomial()

Compound dictation Questions & Answers Watch & Discuss Main idea and devices for developing it How to apply to our real life the typical expressions and patterns taken from the text Blank filling All the exercises for Section A 说明文写作技巧 Pre-reading Activities Expressions & Patterns Exercises Text Analysis Summary Paragraph Writing

The particular reading skill introduced for this unit is reading for the main idea in a paragraph. This skill is one of the most useful reading skills students can develop. Finding the main idea is necessary for the understanding of a piece of writing. Ⅰ. Reading Skills: Reading for the Main Ideas in Paragraphs

II. Listening Skills Listening to People talk about health 1. M: I haven't been to see my doctor for a very long time. I'm worried that he'll be angry with me for not having a physical examination for so long w: Which is more important, the doctors feelings or your health? Youd better go if you want to make sure everything is all right with you. It seems that the man worries more about the doctor's feelings than his own healtl

The power required to propel a new ship is subject to a formidable number of variable items. The family tree of power for propulsion (Fig. 1) shows these divided into two main groups. One is concerned with the resistance to motion caused by the interaction of the hull of the ship with the surrounding water

II. Listening Skills Making Calculations 1. W: It sounds expensive. Why did they charge you so much for repairing the computer? M: Well, its $25 for labor to start with. A new modern cost another 50 bucks. On top of that I needed a new battery, and it cost $17

一、单选题(每题1分,共16分) ()1.在一个图中,所有顶点的度数之和等于图的边数的倍。 A.1/2 B.1 C.2 D.4 ()2.在一个有向图中,所有顶点的入度之和等于所有顶点的出度之和的倍。 A.1/2 B.1 C.2 D.4

人教A版高中数学必修4第二章 平面向量2.1 平面向量的实际背景及基本概念教案(1)