题目

一定温度下，在2 L的密闭容器中，X、Y、Z三种气体的物质的量随时间变化的曲线如右下图所示：  下列描述正确的是(      ) A．反应开始到10 s，用Z表示的反应速率为0.158 mol/(L•s) B．反应开始到10 s，X的物质的量浓度减少了0.79 mol/L C．反应开始到10 s时，Y的转化率为79.0 % D．反应的化学方程式为：X(g)＋Y(g)＝Z(g)Auddrey is a Chinese –American student.She has found many value(价值观)differences between the Chinese and Americans.About money American children love to make money by themselves.Chinese children always ask their parents for money.American parents don’t think it  is useful to send thir children to an expensive university.Chinese parents would do anything to send their children to good universities even if it could make them very poor.About school Many American girls take part in sports,dancing and singing groups.ManyChinese girls take part in academic(学术的)groups.American students usually feel happy when they get B in an exam.Chinese students feel sad when thsey get B.American parents and Chinese parents American parents allow their daughtgers or sons to go out with their friends if they come back home at the certain time .Chinese parents usually don’t allow their children in middle school to go out with their friends at night .American teachers and Chinese teachers During parent–teacher meetings ,American teachers will always find good things to say to the parents ,even to those with the worst grades.But Chinese teachers often tell the parents the mistakes that their children made at school.根据短文内容，判断句子正（T）误（F）【小题1】American children prefer making money by themselves.【小题2】All American and Chines parents send their children to expensive universities.【小题3】Chinese girls spend more time doing sports,singing and dancing than American girls.【小题4】Chinese children usually aren’t allowed to go out with their friends at night.【小题5】American teachers look at the bad side of the students as much as they can.