1）无限小数是无理数；  （2）式子 $\sqrt{a}$ 是二次根式；

3）三点确定一条直线；  （4）多边形的边数越多，内角和越大．

    Betty is an English girl. She studies in a middle school. On weekdays(非休息日) she gets up at 6:30. She has breakfast at seven. Then she goes to school on her bike(自行车). The school is near her home. She gets to school at around seven-thirty.

    Classes start at eight o'clock. She has four classes in the morning and two in the afternoon. Her favorite subject is history. She has lunch at 12:00 at school. Classes end(结束) at three-thirty. After school she usually goes to the history club and then goes home. She gets home at 5:00.

—How does Tina feel?

—Not __________.

我国最新《公共场所控制吸烟条例》要求社会示范人群带头控烟，国家机关工作人员不在公务活动中吸烟，教师不在学生面前吸烟，医务人员不在病人面前吸烟。这表明（   ）

①责任表现在社会生活的方方面面            ②社会身份不同不可能有相同的责任

③中学生没有控烟的责任                            ④只有人人尽责，才能共建和谐美好的社会