如下列关系式中，表示y是x的反比例函数的是（ ） A．y=13x B．y=3x2 C．

公共交通的营运组织，必须具备以下功能( )。

A．适应高峰时大客流的需要

B．运送速度快

C．吸引乘客的能力

D．应对突发事情的能力

E．以速度来缩短空间

英国特技演员史蒂夫•特鲁加里亚曾飞车挑战世界最大环形车道．如图所示，环形车道竖直放置，半径为6m，若汽车在车道上以12m/s恒定的速率运动，演员与汽车的总质量为1000kg，重力加速度g取10m/s²，则（　　）

A．汽车通过最低点时，演员处于超重状态

B．汽车通过最高点时对环形车道的压力为1.4×10⁴N

C．若要挑战成功，汽车在最高点的速率不可能低于12m/s

D．汽车在环形车道上的角速度为1rad/s

某女，60岁，缓慢起病，常有乏力、面色苍白、口腔黏膜萎缩、食欲不振，检查可见对称性的远端肢体麻木、深感觉障碍，血象呈大细胞性贫血，血清叶酸<6．8nml／L。患者平素喜吃软食，无其他疾病。

该患者的应诊断为（）

A.慢性病性贫血

B.缺铁性贫血

C.巨幼红细胞贫血

D.海洋性贫血

E.合并高黏滞血症的贫血

按一级动力学消除的药物的特点是（）

A.药物的半衰期随剂量而改变

B.并非为大多数药物的消除方式

C.单位时间内实际消除的药量递减

D.酶学中的米-曼公式与动力学公式相似

E.以固定的间隔给药，体内血药浓度难以达到稳态

(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.

Children who often watch the program ______ .

A．can have problems in school

B．will find it a great help

C．will take no interest in their studies

D．will be well educated