①∠PCB=15°；

②AD∥BC；

③直线PC与AB垂直；

④四边形ABCD是轴对称图形．

其中正确的有（   ）

气候异常是当今人类面临的重大环境问题，它严重威胁与影响人类的生存和生活。据此回答下列各题。

    Jim Green is a student in No. 5 Middle School. He does a part-time 1because he needs some2. He works in a supermarket after3from Monday to Friday and all4on Saturday. He helps people look after their kids and he plays 5kids. He thinks it is great6. After school, he7a bus to the supermarket. He8there at about 4: 30. He works94: 30 to 8: 30. He gets 10 at 9: 30. Jim likes his job very much.

1911年12月日本《朝日新闻》刊登的一封信写到，“一旦共和政府建立起来，人民的捐税负担会比现在更重。甚至就这一点而言，共和政府也不可能统治中国。中国面临的最重要问题是如何筹措外债使国家免于破产。”材料表明