2010年2月，某城市劳大无风，家庭和工厂排出的烟雾经久不散，每立方米大气中二氧化硫含量高达3.8毫克，烟尘达4.5毫克，居民的健康普遍受到危害，十天之内死亡约4000人。请回答：
(1)流经该城市的主要河流因此受到污染，引起鱼类死亡。这与该类型的大气污染能形成______________有关。
(2)这种大气污染主要污染物是_____________，对人体的_______系统危害最大，将会造成__________________(最少举出2种)等病症。
(3)该大气污染的污染物直接危害高等植物的_____________等器官。
(4)要防止类似悲剧的发生，应该采取的措施是_____________________。
(1)酸雨
(2)二氧化硫和烟尘；呼吸；咳嗽、呼吸困难、喉痛、支气管哮喘、肺气肿(写出2种即可)
(3)芽和叶
(4)严格控制污染源或大力采取生物净化措施，消除环境污染
Who says honesty (诚实) is dead? Last Tuesday morning Alan Reed, a student at Claremont College here, was getting 1 money out of the bank. He wanted to have 50 dollars and the teller (出纳) 2 him five twenties instead of five tens. For a few seconds, Alan wondered (疑惑) 3 to do it. Should he give the extra money back? Keep it? 4 he kept it, he could buy several new CDs, or he could take his friend Simon to a big dinner. 5 no one would ever notice (注意). But then he 6 the teller. She was a middle-aged woman with a sweet face, and she reminded(提醒) him of his mother. She had been nice to him. Then he thought that there were probably exact (精确的) 7 kept of how much money was paid out, and the 8 would probably get in trouble. 9 of all, Alan felt he would probably feel 10 about keeping the extra money. So Alan gave back the money.
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