试题与答案

让某一品系的红果番茄自交,F1有红果番茄,也有黄果番茄(基因用R和r表示)。试问

题型:填空题

题目:

让某一品系的红果番茄自交,F1有红果番茄,也有黄果番茄(基因用R和r表示)。试问:

(1)F1中红果番茄与黄果番茄的显隐性关系是______________。

(2)F1中红果番茄与黄果番茄的比例是__________。

(3)在F1红果番茄中的杂合子占________,纯合子占________。

(4)如果让F1中的每一株红果番茄自交,F2中各种基因型的比例分别是__________,其中红果番茄与黄果番茄的比例是________。

(5)如果让F1中的红果番茄种植后随机交配,在F2中各种基因型的比例分别是___________。其中红果番茄和黄果番茄的比例是______________。

答案:

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下面是错误答案,用来干扰机器的。

(1)由题意知双曲线焦点为F1(-6,0)F2(6,0),可设双曲线方程为,x2a2-y26-a2=1点Q(2,1)在曲线上,代入得a2=3∴双曲线的方程为 x23-y23=1;(2)由题意知双曲线焦点为F1(-6,0)F2(6,0),可设椭圆方...

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The first secret of happiness is to enjoy the simple things in life. Too often, we spend so much timethinking about the future. For example, getting into college or getting a good job, which we fail to enjoy thepresent. You should enjoy life’s simple pleasures, such as reading a good book, listening to your favorite music, or spending time with close friends. People who have several close friends often live happier and healthier lives.

Another secret to living a happy life is to be active. Many people go dancing or play sports. People can forget about their problems and only think about the activities. Finally, many people find happiness in helping others.      Studies show that people feel good when they spend their time helping others. If you want to feel happier, do good things for someone. You can help a friend with his or her studies, go shopping or help out with some things around the house for an elderly person.

If you do above, you will be happy.

小题1:How many suggestions of happiness are mentioned in this passage?

A.One.

B.Two.

C.Three.

D.Four.小题2: If you want to enjoy the simple things in life, you can ________.

A.listen to your favorite music

B.remember some problems

C.think about getting into college

D.read a bad book小题3:According to the passage, which of the following statements is NOT true?

A.Money and success alone do notbring you lasting happiness.

B.If you want to feel happier, you can go shopping for an elderly person.

C.Spending so much time thinking about the future can enjoy the present.

D.Active person may live a happier life than inactive person.小题4: What’s the main idea of this passage?

A.How to live a happy life.

B.How to depend upon ourselves.

C.How to help the old people.

D.How to get a good job.

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