1Gases such as carbon monoxide, emitted by factories and automobiles, have seriously polluted the atmosphere.工厂和汽车发出的一氧化碳一类的气体严重污染了大气2The industrial engineers letter indicates that he doubts the feasibility of the plan.那为工业管理工程师来的信表明，他对改项计划是否可行有怀疑3Many parents in the United States set aside a fund for their childrens education before they are born.美国许多父母在孩子出生之前就为他们的教育留出一笔专款4I have made sure that her conclusion is based on facts.我已了解清楚，她的结论是以事实为根据的5 The medical team, compos
