题目

完形填空Londonlife for Cathy Hagner and her three children is set to be permanent. Their1schoolday and her job as a lawyer's assistant are busy enough.2Hagneralso has to take the two boys to soccer or hockey or basketball while droppingoff her3at piano lessons or Girl Scout Club. 4,the exhausted family doesn't get home until 7 pm. There is just time for aquick5before homework. Intoday's world, middle class American and British parents treat their children6theywere competitors 7for some finishing line. Parentstake their children from activity to activity to make their future8.It seems that 若NA代表阿伏加德罗常数，下列说法正确的是( )A. 46gNO2和N2O4的混合液中总原子数为3NAB. 4℃时9mL水和11.2L氮气含有相同的分子数C. 同温同压下，NA个CO2与NA个N2和O2的混合气体的体积不相等D. 1.01×105Pa时，11.2 L氧气所含的原子数目为NA