The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.
Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450,000-year-old microorganisms pre served in cores of sediment taken beneath the floor of the Indian Ocean. They provide a re cord of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth's orbital geometry caused the ice ages.
This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature's interconnectedness, it is possible that the most serious threats have yet to be recognized.
The first paragraph of the text deals mainly with the earth atmosphere's.
A.sheltering effect
B.reviving effect
C.invigorating effect
D.cleansing effect
第1题
在微机系统中,对输入输出设备进行管理的基本程序模块(BIOS)存放在 ()
A.RAM中
B.ROM中
C.硬盘中
D.寄存器中
第2题
微型机系统中,对输入设备赶进行管理的基本程序模块(BIOS)存放在 ()
A.RAM中
B.ROM中
C.硬盘中
D.寄存器中
第4题
在微机系统中,启动计算机的最基本程序是()。
A.RAM中
B.ROM中
C.硬盘中
D.寄存盘中
第5题
微机系统在运行时,管理外部设备工作的最基本程序是放在()。
A.RAM中
B.ROM中
C.软盘上
D.硬盘中
第6题
在微机中,基本输入输出程序(BIOS)存放在()。
A.CPU的寄存器中
B.微机内存ROM中
C.硬盘中
D.微机内存RAM中
第7题
在微机中,基本输入输出程序(BIOS)存放在()。
A.CPU的寄存器中
B.微机内存ROM中
C.硬盘中
D.微机内存RAM中
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