题目

Carolyn Stradley is the founder of C&S Paving Inc．（铺路公司） in Atlanta, USA．In the following account, she recalls the job that challenged her __1__ and skill but left her flying high． “When the Atlanta Airport was under __2__in 1979,we were a new company struggling to make it．National Car Rental wanted to have 2,500 square meters of dirt paved __3__the cars could be on site __4__．the airport opened, and the official opening was only ten days away! __5__other local paving company wanted to do the job, __6__it couldn’t be done in such a short time． “Because we were在氮气、氧气、氢气、二氧化碳、二氧化硫、氖气六种物质中，选择合适的物质填空（每种物质只能选一次）：（1）能使石灰水变浑浊的是二氧化碳二氧化碳；（2）用在电工的测电笔中的是氖气氖气；（3）能用于炼钢、气焊和医疗急救的氧气氧气；（4）会造成空气污染的是二氧化硫二氧化硫；（5）常充入食品包装袋中防腐的是氮气氮气；（6）可作为火箭燃料的是氢气氢气．