关于子宫内膜异位症的预防，下列哪项是错误的A．经期不做妇科检查 B．纠正过度后倾的子

强强是个很听话的孩子，从幼儿园到上小学从没有让家长操过心。可自从上了中学，他就像变了一个人似的，做起事来我行我素，常常使家长着急，如回家晚，星期天出去找同学玩，也不和家长打声招呼。许多事强强认为没有必要告诉家长，可父母总是要管，强强感到真烦恼。

（1）你认为强强出现这种变化的原因是什么？

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（2）对强强这样做，你的看法是什么？

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（3）强强要变得更加成熟，应该怎么做？

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单克隆抗体具有很强特异性的直接原因是[ ]

A．分子结构具有特异性

B．基因结构具有特异性

C．抗原的抗原决定簇具有特异性

D．合成场所的特异性

Until recently, most population growth has occurred in relatively dense urban environments. In (91) words, even if we were witnessing rapid population growth, that would not mean that the (92) were filling in with people. (93) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (94) the jobs were. Jobs were usually in ports or locations with many natural (95) . After transportation became relatively cheap, other geographical locations became (96) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (97) . And individuals working in cities (98) higher incomes than those working in (99) areas. Hence, population has tended until the 1970s to (100) in our major urban centers. Recently population has (101) out of the Northeast to the South and to the West for the more pleasant climates. If people did not (102) from living in large cities, there would likely be a much more even population distribution (103) our entire land area. Probably, if this (104) the case, there would be less concern over population (105) Indeed, one need only (106) a cross-country drive or plane trip to realize how (107) populated these United States really are. This is not to say that we should or should not do something about (108) growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in (109) urban environments. And this problem may be slowly correcting (110) .

A．underpopulated

B．overcrowded

C．polluted

D．inhabited

溢流量为16～100L／min的中流量安全阀适用于顶板来压（）的工作面支架立柱。

A、强烈

B、较强烈

C、不强烈

D、极强烈