人体内二氧化碳扩散的方向是（  ）

两位朋友一起穿越沙漠，在旅途中他们发生了争执。其中一位打了另一位朋友一记耳光。被打耳光的这位朋友感到自己受到了伤害，但他一句话也没说，就在地上写道：“今天我最好的朋友打了我耳光。”然后他们又接着赶路，直到看见一片绿洲，他们决定停下来洗个澡。被打耳光的这位朋友陷进泥潭中差点淹死，是他的朋友救了他，当他从死亡的边缘挣扎过来时，他拿了一把小剑在一块石头上刻下：“今天，我最好的朋友救了我的命。”打了朋友又救了朋友的这个人就问他：“我伤害了你以后，你写在沙地上，而现在你却刻在石头上，为什么？”

①老师要求多次迟到的小刚在同学面前承认自己走路比乌龟爬得还要慢

②警方发布通缉令，使用犯罪嫌疑人的照片

③年满18周岁后，牛平更改个人姓名

④杂志编辑在征得小立的同意下，把小立的相片刊登于封面，并支付相应的报酬

    In Britain，the government，school leaders，teachers and parents all agree that students should wear uniforms．B____ British private schools have their own school uniforms．They think it's i____ for pupils to wear school uniforms．

    School leaders normally decide if pupils will have to wear a uniform，and they a____ decide what it should look like．You know，no students want to wear65．u____ uniforms．

    Everybody wants to wear beautiful uniforms．

    Leaders have to follows the rules，and they c____ just choose anything they like．They have to t____ of the students' feeling and taste．Here are a few f____ leaders should consider．

    ①Cost．This is the first fact they should consider．Their uniforms shouldn't be too e____ because it may cause problems for some families．Not all the families can afford it．

    ②Sexism（性别歧视）．The uniform policy must be equally fair（公平的）for boys and g____．

    ③Cultrues and races．School rules must a____ pupils from all backgrounds to wear a uniform，for example，allowing Muslim（穆斯林）girls to wear an appropriate dress and Sikh（印度锡克教徒）boys to wear a traditional headdress（头饰）．