书面表达
假如你是李华，校学生会主席，得知著名英国教授Matrix在你校参加英语教师培训会（2016年3月28日—3月30日），特邀请Matrix在开会期间给你校学生做一个关于英语写作的讲座。
请按下列要点写一封邀请信：
1. 本人简介；
2. 讲座内容；
3. 表示感谢。
注意：1. 词数：100左右。
2. 可以适当增加细节，以使行文连贯。
3. 参考词汇：学生会 the Students’ Union
培训会 training conference
Dear Professor Matrix,
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
Yours sincerely,
Li Hua
学英语2021新教材高一报纸试题答案
阅读理解
Have you ever heard a news reporter talk about DNA?Reporters talk about DNA found at the scene of a crime.They talk about police finding DNA “fingerprints”.Police sometimes use DNA as a clue to find out who committed the crime.
DNA is a substance(物质)that makes up genes.Everything alive has genes.Plants have genes.Animals have genes.You have genes.
Genes are the basic units of heredity(遗传).Heredity means all the characteristics you inherit from your parents.You get your genes from your parents.You inherit half of your genes from your mother.You inherit half of your genes from your father.
Genes are a kind of code.A tree’s genes tell what shape its leaves will be.A cat’s genes tell what color its fur will be.Your genes tell what color your eyes will be.Your genes tell what color your hair will be.Everything about you comes from the code in your genes.
Genes line up on strands(链)called chromosomes(染色体)in cells.Everything alive is made up of cells.Chromosomes are in the center,or nucleus of cells.
Different parts of you are made of different kinds of cells.Your muscles are made of muscle cells.Your skin is made of skin cells.The code in your genes tells your body to make different kinds of cells.The genes in each cell tell the cell how to work.They tell the cell when to make new copies of itself.
An Austrian monk named Gregor Mendel first saw inherited patterns in pea plants.He experimented with pea plants in the 1860s.One of the things,or traits(特质) Mendel studied was what makes some pea plants tall and some short.He said that the traits must come from units of heredity passed from the parent plants.These units were later called genes.