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In the late l960s．many people in North America turned their attention to environmental problems，and new steel-and-glass skyscraper,5 were widely criticized．Ecologists pointed out that acluster of tall buildings in a city often overburdens public transportation and parking lot capacities．
Skyscrapers are also lavish consumers，and wasters，of electric power．In one recent year．The addition of l7 million square feet of skyscraper omce space in New York City raised the peak daib demand for electricity by l20，000 kilowatts--enough tO supply the entire city of Albany，New York，for a day．
Glass·walled skyscrapers can be especially wasteful．The heat loss(or gain)through a wall of half-inch plate glass is more than ten times that through a typical masonry wall filled with insula．tion board．To lessen the strain on heating and air conditioning equipment，builders of skyscrapers have begun to use double glazed panels of glass，and reflective glasses coated with siNer or gold
mirror films that reduce glare aS well as heat gain．However，mirror-walled skyscrapers raise the temperature of the surrounding air and affect neighboring buildings．
Skyscrapers put a severe strain on a city’S sanitation facilities，t00．If fully occupied，the two World Trade Center towers in New York City would alone generate 2．25 million gallons of raw sewage each year--as much as a city the size of Stamford, Connecticut, which has a population ofmore than 109,000．
Skyscrapers also interfere with television reception, block bird flyways, and obstruct air traffic．
In Boston in the late 1960s, some people even feared that shadows from skyscrapers would kill the grass on Boston Common．
Still, people continue to build skyscrapers for all the reasons that they have always built them-personal ambition, civic pride, and the desire of owners to have the largest possible amount of rentable space．
The main purpose of the passage is to ( )
主旨题。本篇短文的主要目的是描述摩天大楼以及摩天大楼对环境造成的影响。文章的第一段是主题段(topic sentence)。作者在这一段首先从整体上提出了摩天大楼对环境造成的影响．然后在下面的几段具体地从几个方面论述了对环境造成的影响。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
