移动通信网的基本网络结构包括哪些功能？

横线里最大能填几？

______×6＜56

______×4＜30

______×9＜62

8×______＜73．

进出境快件中，______适用“中华人民共和国海关进出境快件KJ2报关单”申报。

A．关税税额在人民币50元以下的货物

B．没有商业价值的广告品

C．零星进口的进料加工料件

D．从境外返回的单件修理物品

国家基本药物目录中的药品包括（）。

A.化学药品

B.生物制品

C.中成药

D.疫苗

E.民族药（2010年考试真题）

下列选项中，（）质量是物流服务项目的基础质量，是物流服务系统的输入条件。

A.物流工程

B.物流服务

C.物流工作

D.货物

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. Plans 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 celIs. 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.

In the mid-1900s, scientists discovered that genes are made of DNA. In the 1970s, scientists learned how to change DNA with genetic engineering. Scientists also learned that problems with certain genes cause diseases. Muscular dystrophy, cystic fibrosis, and hemophilia are some genetic diseases-diseases caused by problems in genes. Today, scientists are looking for ways to cure genetic diseases by changing genes through a process called gene therapy.

小题1: What is DNA?

A．DNA is a kind of gene.

B．DNA is a substance that makes up genes.

C．DNA is the basic unit of heredity.

D．DNA is a measure to protect crime.小题2: Which of the following about genes is correct according to the passage?

A．Plants, animals and human beings have the same genes.

B．Half people inherit all genes from their mother, others from their father.

C．Genes decide the trees shapes, the cats’ fur color and our eyes’ color as well.

D．Genes will give you a code when you need them.小题3:Where are genes?

A．Genes lining up on strands called chromosomes are in the center of cells.

B．Genes hide in everything alive in your body.

C．Genes can be nowhere but in your mind, controlling all your actions.

D．Genes travel in your body and help cope skin, muscle, and eyes.小题4:An Austrian monk named Gregor Mendel         .

A．first saw inherited patterns in people

B．was interested in why plants were different

C．first called the units of heredity from parents genes

D．was the first who discovered genes小题5: We can conclude that         .

A．scientists were less intelligent than monks in 1900s

B．some genes are bad and can cause diseases

C．we don’t need to worry about genetic diseases any longer

D．the discovery of genes may be of great help in our daily life