Suggested questions:

①How many class rules do you have?

②What must you do in the class?

③What mustn't you do in the class?

计除叛贼

    曹玮帅秦州。当赵德明叛，边庭駭动，玮方与客对弈。吏报有叛卒投德明者，玮弈如常。至于再三，徐顾吏曰：“此吾所遣，后勿复言。”德明闻，杀投者。卒遂不复叛。

【注释】曹玮：字室臣，北宋名将。统兵四十年，不曾失利。

夏天，刚从冰箱里拿出来的冰棍上面挂有一层白花花的“粉”；剥去包装纸，冰棍周围冒“白烟”，请解释其中的“粉”、“白烟”各是怎样形成的？

Either Mary or he _______ going to Paris．Only one person may go there.