问题 单项选择题

下列关于人类遗传病的叙述,错误的是()

①多基因遗传病的遗传不遵循孟德尔遗传定律

②一个家族几代人中都出现过的疾病是遗传病

③21三体综合征和猫叫综合征患者都属于染色体数目异常遗传病

④不携带遗传病基因的个体不会患遗传病

A.②④

B.③④

C.②③

D.②③④

答案

参考答案:D

解析:

孟德尔遗传定律只适用于单基因遗传病,因此多基因遗传病的遗传不遵循孟德尔遗传定律,故①正确;一个家族几代人中都出现过的疾病不一是遗传病,也可能是传染性疾病等,故②错;21三体综合征属于染色体数目异常遗传病,而猫叫综合征属于染色体结构异常遗传病,故③错;不携带遗传病基因的个体不会患遗传病,如染色体异常遗传病,故④错。故选D

考点:本题考查人类遗传病的相关知识。

点评:本题意在考查考生的识记能力和理解判断能力,属于中等难度题。

阅读理解

Dear Eric:
Linda and I have been best friends since we were six years old. We often study and play together. It’s great! But she often gets unhappy when I get better grades than her –she really gets jealous. Should I keep taking her as my friend?
Yours,
Alice
Hi Alice,
I think friendship is important in our lives. You should talk to your friend. Tell her you’re both studying and it’s common that sometimes you get a better grade and sometimes she does better. Tell her you’re going to compete(比赛) with her and try to beat her in every test . maybe you can tell her that if she beats you, you’ll buy her some chocolate or something like that. If you can make your schoolwork into a game, you’ll both win in the long run (从长远看), and you will both start to get better grades in your subjects. If it’s a game, you’ll both enjoy school a lot more, and you’ll still be best friends.
Your,
Eric
小题1: The word “jealous” means “   ” in Chinese.
A.崇拜的B.嫉妒的C.同情的D.担心的
小题2:From Alice’s letter, we know Linda
A.is an unfriendly girlB.iS Eric’s best friend
C.often has a fight with AliceD.knew Alice many years ago
小题3: What’s Alice’s problem?
A.She doesn’t know how to get better grades.
B.She doesn’t know what to do to help Linda with her schoolwork.
C.She doesn’t know whether she would be friends with Linda anymore.
D.She doesn’t know how to get along with her teachers and classmates.
小题4:Eric asks Alice to talk to her best friend and
A.compete with herB.say sorry to her
C.lose to her in each testD.help her with her homework
小题5:What may happen if Alice and Linda follow Eric’s suggestions?
A.They’ll never speak with each other
B.Both Alice and Linda will do better at school
C.Linda will get mad at Alice and argue with her
D.Alice will get some chocolate from Linda after each game.
多项选择题