乳腺良性与恶性肿物的超声显示鉴别点是（）。 A.边界是否光滑、完整 B.内部是否回声

下面一段文字中有3处用词不当，请找出并加以修改。

现在，越来越多的家长感触听不懂自己孩子常用的词语，交谈时如同听外星人讲话；越来越多的孩子埋怨父母跟不上时代，无法和他们勾通。当大家都在抱怨对方的时候，英国13岁少女露西出版了一部包括了300多个新词、怪词的新新人类专用词典，使家长破译青少年“语言密码”提供了便利。这种创意和实际行动实在叹为观止。

下列不属于限制竞争行为的是( )。

A．某县文化限定所有的中小学必须购买某一经营某的文化用品

B．某省政府最近下发一通知，所有购买外地商品的本地商品经营者都必须交纳购买税

C．某县邮电局通知全县人民，所有想装电话的用户都必须从邮电局买电话机

D．某电影进行有奖看电影，最高奖是一辆八千元的摩托车

“笼屉”作为寻常百姓家必备的炊具，从来没有登上过大雅之堂。据说最( )的待遇是在旧社会曾用笼屉作为饭店门口的幌子，食客们只要一看到门口悬挂的笼屉层数，就知道饭店的档次。

A．优厚

B．体面

C．优惠

D．特殊

下列物质中，含有离子键的是

A．N₂

B．HCl

C．CaCl₂

D．CO₂

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.

It was suggested but not stated that the American West is the place where ______ .

A．young people are reluctant to go
B．people may possibly get wealthy
C．it is more interesting to settle
D．the old people’s dreams can be realized