在大气层内，大气密度
A.在同温层内随高度增加保持不变
B.随高度增加而增加
C.随高度增加而减小
相关标签： 同温层 大气层
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波音B-52亚音速远程战略轰炸机的绰号是“同温层堡垒”。
A、对
B、错
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s="" surface（）="" .
2.The writer states that fungi and bacteria（ ）.
3.The passage says that the biosphere（ ）.
4.According to the text, the balance of nature is（ ）.
5.The writer says that ecology is primarily concerned with the（ ）.
'>The biosphere is the name biologists give to the sort of skin on the surface of this planet that is inhabitable by living organisms. Most land creatures occupy only the interface between the atmosphere and the land; birds extend their range for a few hundred feet into the atmosphere: burrowing invertebrates （无脊椎动物） such as earthworms may reach a few yards into the soil but rarely penetrate farther unless, it has been recently disturbed by men. Fish cover a wider range, from just beneath the surface of the sea to those depths of greater than a mile inhabited by specialized creatures. Fungi （真菌） and bacteria are plentiful in the atmosphere to a height of about half a mile, blown there by winds from the lower air. Balloon exploration of the stratosphere （同温层） as long ago as 1936 indicated that moulds and bacteria could be found at heights of several miles, recently the USA’s National Aeronautics and Space Administration has detected them, in decreasing numbers, at heights up to eighteen miles. They are pretty sparse at such levels, about one for every two thousand cubic feet, compared with 50 to 100 per cubic foot at two to six miles (the usual altitude of jet aircraft), and they are almost certainly in an inactive state. Marine bacteria have been detected at the bottom of the deep Pacific trench, sometimes as deep as seven miles; they are certainly not inactive. Living microbes have also been obtained on land from cores of rock drilled (while prospecting for oil) at depths of as much as 1,200 feet. Thus we can say, disregarding the exploits of astronauts, that the biosphere has a maximum thickness of about twenty-five miles. Active living processes occur only within a compass of about seven miles, in the sea, on land and in the lower atmosphere, but the majority of living creatures live within a zone of a hundred feet or so. If this planet were sealed down to the size of an orange, the biosphere, at its extreme width, would occupy the thickness of the orange-colored skin, excluding the pith.In this tiny zone of our planet takes place the multitude of chemical and biological activities that we call life. The way in which living creatures interact with each other, depend on each other or compete with each other, has fascinated thinkers since the beginning of recorded history. Living things exist in a fine balance which is often taken for granted, from a practical point of view, things could not be otherwise. Yet it is a source of continual amazement to scientists because of its intricacy and delicacy. The balance of nature is obvious most often when it is disturbed. Yet even here it can seem remarkable how quickly it readjusts itself to a new balance after a disturbance. The science of ecology...the study of the interaction of organisms with their environment...has grown up to deal with the minutiae of the balance of nature.
1.According to the passage, the “biosphere” is the layer on the earth's surface（） .
2.The writer states that fungi and bacteria（ ）.
3.The passage says that the biosphere（ ）.
4.According to the text, the balance of nature is（ ）.
5.The writer says that ecology is primarily concerned with the（ ）.
A.where the atmosphere meets the sea B.in which birds, fish and animals would die C.in which plant and animal life can exist D.in which earthworms and other invertebrates can live问题2： A.are only found below the normal altitude of jet planes B.have been found well at the normal altitude of jet planes C.are not found below the surface of the earth D.are mainly found below the surface of the earth问题3： A.extends only 1,200 feet below the earth's surface B.is about seven miles in width C.is as much as twenty-five miles in thickness D.is a zone only about one hundred feet wide问题4： A.something which we should not take for g -
有关平流层特征及卫生学意义哪一项论述是错误的()(本题2.0分)
A.平流层在对流层之上
B.平流层又分两个亚层:同温层和臭氧层
C.臭氧层能吸收短波紫外线,保护人体不受短波紫外线伤害
D.同温层在臭氧层下面
E.各种气象现象都是在平流层中发生 -
尽管方兴未艾的太空旅游业听起来激动人心，但根据发表在最新一期《地球物理研究通讯》杂志上的研究结果，如果每年私人火箭的发射次数超过1000次，大气同温层中的污染物质煤烟的含量将会显著升高，由此可能改变全球大气循环及臭氧的分布。据研究人员计算，这将使地球两极表面温度升高1摄氏度，并使极地海洋冰层厚度减少5%到15%。尽管存在于接近地表大气中的煤烟微粒可以在降雨过程中被冲刷干净，但在根本不会有雨水的同温层中，这些污染物的留存时间却可能长达3年到10年，并对地球温度造成持久影响。对这段文字理解正确的一项是：
A.太空旅游业的蓬勃发展会改变全球大气循环及臭氧的分布B.大气同温层中的污染物质煤烟的含量会随着私人火箭发射次数的增加而显著升高C.每年火箭发射次数超过1000次，会使地球温度升高1摄氏度D.同温层中的污染物会留存3年到10年，会对地球温度造成持久影响 -
有关平流层特征及卫生学意义哪一项论述是错误的？（ ）
A、平流层在对流层之上
B、平流层又分两个亚层：同温层和臭氧层
C、臭氧层能吸收短波紫外线，保护人体不受短波紫外线伤害
D、同温层在臭氧层下面
E、各种气象现象都是