魏文侯与虞人^①期猎。是日，饮酒乐，天雨。文侯将出，左右曰：“今日饮酒乐，天又雨，公将焉之^②？”文侯日：“吾与虞人期猎，虽乐，岂可不一会期哉？”乃往，身自罢之。

（司马光《资治通鉴·魏文侯书》）

【注释】①虞（yǘ）人：侍卫。②焉之：到哪里。

如图，AO⊥OC，解答下列问题：

①比较∠AOB、∠AOC、∠AOD、∠AOE的大小，并指明其中的锐角、直角、钝角及平角；

②写出∠AOB、∠AOC、∠BOC、∠AOE中某些角之间的两个等量关系．

I hope____ ____there with you.

B

    We all need to exercise. Doctors say it is good for us. It makes our heart and body strong. It also gives you more energy(能量). And you will feel better about yourself. It's best to exercise twice a week. Twenty minutes each time is enough.

    There are many ways to exercise. You can walk, run, play sports or swim. Many people go to special places to exercise. They are called "fitness centers". These places have a lot of equipment(设备). Some people buy equipment for their homes. But it's very expensive.

    Exercising can be fun. Friends can exercise together at fitness centers. Or they can play sports together. How do you exercise? How often do you exercise?