克隆技术在植物、动物和其他生物研究领域中都已应用.但是克隆动物要比克隆植物困难和

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克隆技术在植物、动物和其他生物研究领域中都已应用.但是克隆动物要比克隆植物困难和复杂得多.那么,科学家是怎样培育出克隆羊“多莉”的呢?请你分析下图中克隆羊“多莉”的培育过程,从中寻找科学家取得成功的“秘诀”.①从母羊A卵巢中取出一个卵细胞,去除卵的细胞核;②从另一只成年母羊B的乳腺牛取出一个细胞,分离出该细胞的细胞核;③将乳腺细胞的分离核注入去核的卵细胞内,重组一个细胞;④用细胞培养技术使重组细胞发育成胚胎,再植入母羊C子宫里.5个月后,母羊C分娩产下小羊“多莉”.

(1)“多莉”好像有三个母亲,它真正的母亲是______.

A、母羊A             B、母羊B

C、母羊C             D、难以确定

(2)“多莉”羊说明控制生物性状的基因主要在______.

A、细胞核内B、细胞质内

C、细胞膜内D、子宫内

(3)你认为科学家利用哪些生物技术是取得克隆动物成功的“秘诀”?

答:______

(4)你认为克隆动物成功有哪些意义?

答:______

考点:克隆技术
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两个圆柱体侧面积相等,它们的体积也一定相等.

改:______.

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Many teenagers feel that the most important people in their lives are their friends. They believe that their family members, especially their parents, don't know them as well as their friends do. In large families, it is often for brothers and sisters to fight with each other and then they can only go to their friends for advice.
It is very important for teenagers to have one good friend or many friends. Even when they are not with their friends, they usually spend a lot of time talking among themselves on the phone. This communication is very important in children's growing up, because friends can discuss something difficult to say to their family members.
However, parents often try to choose their children's friends for them. Some parents may even stop their children from meeting their good friends. The question of "choice" is an interesting one. Have you ever thought of the following questions?
Who choose your friends?
Do you choose your friends or your friends choose you?
Have you got a good friend your parents don't like?
小题1:Many teenagers think their         know them better than their parents do.
A. friends               B. teachers       
C. brothers and sisters     D. classmates
小题2:When teenagers stay alone, the usual way of communication is to        .
A. go to their friends                  B. talk with their parents
C. have a discussion with their family    D. talk with their friends on the phone
小题3:Which of the following is different in meaning from the sentence "Some parents may even stop their children from meeting their good friends."?
A. Some parents may even not allow their children to meet their good friends.
B. Some parents may even ask their children to stay away from their good friends.
C. Some parents may even not let their children meet their good friends.
D. Some parents may want their children to stop to meet their good friends.
小题4:The passage suggests (暗示) that _______.
A. Parents cannot choose friends for their children successfully
B. Perhaps some children's friends are chosen by their parents.
C. Children won't let their parents choose friends for them.
D. Parents often try to choose their children's friends for them.
小题5:Which of the following do you think is right according to the passage?
A. Parents should like everything their children enjoy.
B. In all families, children can choose everything they like.
C. Parents should try their best to understand their children better.
D. Teenagers can only go to their friends for help.
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准确读数可以减小测量的系统误差。()

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近年来,我国在世界许多国家成功举办了“中国文化周”、“中国文化月”、“中国文化年”等活动,受到普遍欢迎。这说明()

①中国文化已成为世界文化的主流

②文化交流能促进中华文化的传播

③文化是民族的,又是世界的

④文化交流就是要消除文化差异

A.②③

B.③④

C.①②

D.①②③

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卷烟、粮食白酒、薯类白酒在生产销售和进口环节计算消费税时,实行复合计税方法计算消费税,但在委托加工环节代收代缴销费税时,实行单一从价计税方法。( )

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