题目

Some people think that as more and more people have televisions in their homes,      people will buy books and newspapers. A．more and more                                  B．any the less C．more or less                                      D．fewer and fewer 答案：D4、下列实验操作正确，且不涉及化学变化的是（　　）A、二氧化碳通入石蕊试液中B、检查气密性C、加热高锰酸钾制氧气D、干燥二氧化碳