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问题 选择题

下列自然带中，我国缺失的有：

A 亚热带常绿硬叶林带；    B 热带雨林带；

C 亚热带常绿阔叶林带 ；   D 温带草原带

答案

答案：A

本题考查世界主要气候类型和自然带的分布。我国西南西双版纳有热带雨林带；东部亚热带季风气候形成亚热带常绿阔叶林，内蒙古有温带草原带。我国没有地中海气候，所以就没有亚热带常绿硬叶林。选择A项。

单项选择题

足月新生儿生后第3天，家长见他每隔10～15秒后有5～10秒"不呼吸"，但无皮肤颜色及心率改变，应作何处理（）。

A.给予咖啡因

B.给予氨茶碱

C.持续气道正压（CPAP）给氧

D.给予洛贝林

E.向家长解释，观察
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单项选择题

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．Therefore

B．Moreover

C．Rather

D．Otherwise
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