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问题 选择题

下列有关于真核细胞生物膜的叙述，正确的是[ ]

A．生物膜的特定功能主要由膜蛋白决定

B．构成膜的脂质主要是磷脂、脂肪和胆固醇

C．有氧呼吸及光合作用产生ATP均在膜上进行

D．核糖体、内质网、高尔基体的膜都参与蛋白质的合成与运输

答案

答案：A

口语交际，情景问答题

见证是一种经历，也是人生、社会记忆的凝聚。在生命历程中，我们见证了人生的悲喜、社会的变迁；在历史长河中，许多人或失误又成为历史的见证。

请以“见证”为题，写一篇不少于800字的文章。

要求：1、自选角度。2、自定立意。3、除诗歌外，文体不限。4、文体特征鲜明。
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单项选择题

"Sesame Street" has been called "the longest street in the world". That is because the television program by that name can now be seen in: so many parts of the world. That program became one of American’s exports soon after it went on the air in New York in 1969.
In the United States more than six million children watch the program regularly. The viewers include more than half the nation’s preschool children, from every kind of economic, racial, and geographical group.

The best title for this passage can be ______.
A. TV Programs
B. Educating Children
C. Sesame Street
D. A Great Success

Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from "Sesame Street" are in the same class with children who have not watched the program.
Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional viewers. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly.
The programs all use songs, stories, jokes, and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters.
Why has "Sesame Street" been so much more successful than other children’s shows Many reasons have been suggested. People mention the educational theories of its creators, the support by the government and private businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for: the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more.
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