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问题 单项选择题

通过基因工程，可利用大肠杆菌生产人的胰岛素。下列说法中，正确的是（）

A.通常用鸟枪法直接获得目的基因

B.运载体除了可用质粒，还可以用秋水仙素

C.可以直接用合成胰岛素的信使RNA作为目的基因

D.根据人的胰岛素的氨基酸序列人工合成目的基因

答案

参考答案：D

单项选择题

下列不符合系统性红斑狼疮护理要求的是()

A．床单清洁干燥

B．居室阳光充足

C．病室空气流通

D．病室内温度18～20℃

E．病室内湿度50～60%
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单项选择题

(二)


"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.
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.

"Sesame Street" is actually ______.

A．a street in the US

B．a program for children

C．a program for teachers

D．a program for students
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