[单项选择] In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth’’s surface, warming the planet and creating what is known as the "bio sphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate. 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
A. sheltering effect
B. reviving effect
C. invigorating effect
D. cleansing effect

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[单项选择] In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth’’s surface, warming the planet and creating what is known as the "bio sphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate. 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
A. the protective envelope formed by the atmosphere around the living earth
B. that part of the earth and its atmosphere in which life can exist
C. the living things on earth whose existence is made possible by circulation of the atmosphere
D. the circulation of the atmosphere’’s contribution to life on earth

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Shopping habits in the United States have changed greatly in the last quarter of the 20th century. Early in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was (31) on both sides with many various businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. (32) , some shops offered (33) . These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. (34) in the 1950s, a change began to (35) . Too many automobiles had crowded into Main Street (36) too few parking places were available to shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces (37) the city limits. Open space is what the
A. built
B. designed
C. intented
D. lined

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