Look at the sunshine. It is not so cold yesterday.
A.as B.that C.than
I bought________for my mother. She'll be surprised.
A.special something B.something special C.special thing
—How often do you eat junk food?
—________ever. It's not healthy.
A.Always B.Hardly C.Usually
It's necessary for students to exercise________weekends.
A.on B.for C.in
I want to________a college teacher when I grow up.
A.do B.work C.be
众所周知，树木在人的生产生活中起着非常重要的作用。请根据下面内容下一篇与树木有关的说明文：
1. 树木能为人们提供木材制造建筑，桌椅和纸张。
2. 树木能够制造氧气，净化空气。
3. 在夏天能遮阴，美化环境。
4.防止土壤被水冲走。
5. 我们应该多栽树，保护森林，禁止乱砍乱伐。
要求： 100 字左右，包含所有要点，语句通顺, 表意明确。
参考词汇：architecture，provide shade for people, being washed away
