问题 选择题

小明家喂养的一对白羊交配后,产下1只白羊和2只黑羊,他运用所学生物学知识对羊的遗传现象进行了推断,其中错误的是(有关基因用Ee表示)(  )

A.白色是显性性状

B.母羊的基因组成是EE

C.黑色是隐性性状

D.黑羊的基因组成是ee

答案

这对基因的遗传图解如图所示:因此,在白色与黑色这对相对性状中,白色是显性性状、黑色是隐性性状;公羊和母羊的基因组成都是Ee;子代中,白羊个体的基因组成是EE或Ee,黑羊个体的基因组成是ee.

故选:B

阅读理解

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What to do if you don’t feel popular?

 小题1: Call your friends. Plan to do something. The worst feeling is staying home alone, because it makes you feel even more lonely.

Try to make new friends. Choose friends carefully, not just because you think they’re popular.  小题2:  

Be yourself. If you want to become friends with someone who’s popular, don’t make yourself into someone you are not just to impress that person.

Be nice. Be friendly. Be outgoing. But don’t overdo it! Talk to close friends if you are feeling really bad. Or you might want to write it down in a diary.

 小题3:  You could take pictures of your friends, or collect their school pictures. This will remind you, when you are feeling unpopular.

Think up your own ideas. These suggestions might not work for everyone.

What to do if you have a problem with you teacher?

Talk to your parents, or another adult who will listen to you and perhaps can help. Talk to friends.  小题4:   

Don’t give the teacher a reason to have problems with you. Do your work, complete your task, attend the class seriously and take notes. Maybe you just need to give the teacher a chance.

 小题5:  

Talk to the teacher if you feel comfortable doing this. Don’t be nasty (闹别扭的), but express your concerns. Listen to the teacher, as well.

Just accept the fact that you’re not going to love all your teachers.

A.Try to take part in activities.

B.Do something special for yourself.

C.Smile is the best way to make friends.

D.Try to find out what the problem is.E. Try to deal with the problem all by yourself.

F. Maybe they have had problems with the same teacher, too.

G. And remember, making good friends takes time. Choosing a popular person to be friends with is OK if they are nice.

填空题