题目

甲、乙、丙三个实心正方体分别放在水平地面上，它们对水平地面的压强相等，已知<<．若在三个正方体上分别放一个质量相等的铁块，则三个正方体对水平地面的压强关系为 A．P甲<   P乙<   P丙                 B．P乙< P丙< P甲 C．P丙< P甲<P乙                    D．P甲=P乙=P丙Most American families are smaller than the families in other countries.Most American families have one or two parents and one or two children each. Children in the US will leave their parents’ home when they grow up.They usually live far from their parents because they want to find good jobs.They often write to their parents or telephone them.And they often go to visit their parents on holiday. Parents usually let their children choose their own jobs.Americans think it is important for young people to decide on their lives by themselves. Parents ask children to do some work around their house.And in many families, parents pay their children for doing some housework so that hey learn how to make money for their own use.小题1:The size of most American families is ____ that of other countries’.A．larger thanB．smaller thanC．as big asD．as small as小题2: When children grow up, they leave their parents’ home to __.A．get marriedB．be freeC．find good jobsD．study小题3:They visit their parents ______ .A．on weekdaysB．on weekendsC．at any timeD．on holiday小题4:Which of the following is NOT true ?A．Children have the freedom to choose their own job.B．Parents don’t ask their children to do the housework.C．When children grow up, they usually live far away from their home.D．Parents think it is important for children to make their own decision.小题5:Some parents pay their children for doing housework because _____ .A．they want their children to learn how to make money for themselvesB．their children asked them to do soC．they are richD．the law requires(要求)them to do so