以下能正确定义且赋初值的语句是( )。A．int n1=n2=10； B．char

下列有关冠心病的流行病学特点的描述正确的一项是（）

A.冠心病的发病率男性低于女性

B.65岁以前，女性的首次发病时间平均比男性约早10年

C.在我国冠心病发病率，南方低，北方高，城市高于农村

D.一般脑力劳动者较体力劳动者患病率低

E.好发于夏秋季节

心导管检查右心室血氧含量高于右心房的先天性心脏病是（）

A.房间隔缺损

B.室间隔缺损

C.动脉导管未闭

D.法洛四联症

E.肺动脉狭窄

软玉中的墨玉（）。

A.主要组成矿物是辉石

B.含有石墨

C.主要组成矿物是普通闪石

D.其颜色因组成矿物晶格中含碳离子

肾病综合征的患儿饮食上应注意

A．高蛋白饮食
B．限制蛋白摄入
C．坚持无盐饮食
D．严格限水
E．每日摄入蛋白2g/kg

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.

Which of the following sentences is the main idea of this passage

A．Children in the Old Country are not as happy as their counterparts in America.
B．America is a country in which the concept of children is more emphasized than any other countries in the world.
C．Adults in America are becoming increasingly useless.
D．Adults should learn from their children because they are more energetic.