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问题 单项选择题 共用题干题

免疫细胞的异常增殖常与某些肿瘤的发生发展密切相关。请选择以下各种肿瘤是由何种免疫细胞异常增殖引起的。

非霍奇金淋巴瘤表现为（）

A.B淋巴细胞异常增殖

B.T淋巴细胞异常增殖

C.浆细胞异常增殖

D.单核细胞异常增殖

E.淋巴细胞异常增殖

答案

参考答案：E

选择题

物体做平抛运动时，它的速度的方向和水平方向间的夹角α的正切tanα随时间t变化的图象是图中的（　　）

A．

B．

C．

D．
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单项选择题

Children are a relatively modem invention. Until a few hundred years ago they look like adult, wearing grown-up clothes and grown-up expressions, performing grown-up tasks. Children did not exist because the family as we know it had not evolved.
Children today not only exist; they have taken over in no place more than in America, and at no time more than now. It is always Kids Country here. Our civilization is child-centered, child-obsessed. A kid’s body is our physical ideal. In Kids Country we do not permit middle-aged. Thirty is promoted over 50, but 30 knows that soon his time to be overtaken will come.
We are the first society in which parents expect to learn from their children. Such a topsy-turvy situation has come to abort at least in part because, unlike the rest of the world, ours is an immigrant society, and for immigrants the only hope is in the kids. In the Old Country, that is, Europe, hope was in the father, and how much wealth he could accumulate and pass along to his children. In the growth pattern of America and its ever- expanding frontier, the young man was ever advised to GO WEST; the father was ever inheriting from his son. Kids Country may be the inevitable result.
Kids Country is not at all bad. America is the greatest country in the world to grow up in because it is Kids Country. We not only wear kids clothes and eat kids food; we dream kids dreams and make them come tree. It was, after all, a boys’ game to go to the moon.
If in the old days children did not exist, it seems equally true today that adults, as a class, have begun to disappear, condemning all of us to remain boys and girls forever, jogging and doing push-ups against eternity.

Going to the moon is an example of ______ .

A．America’s dreams and creativity
B．America’s childish and queer behavior
C．why America hasn’t grown up
D．why America is considered as the greatest country in the world
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