《白杨》（我只是帮帮你开头结尾，正文自己写！）
       只要想起边疆，就能想到沙漠，在这个寸草不生的地方，空气是那么的浑浊，水源是那么的缺少。（xxxxxxxxxxxxxxxxx）但是，就是在这个地方，长出了一片绿色，即使在沙漠中似乎毫不起眼，即使绿的是那么可怜，可是它依旧挺起了腰板，像是在沙漠中的卫士，它就是白杨。（最好扯长点。用点形容词捏）
（xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx）这里讲白杨的优点，以及他就像那些建设边疆的，为了祖国而付出青春的人。这下就是接物喻人了！
       白杨，在最需要它的地方出现了，为荒凉的沙漠增添了美丽，迎着风沙，迎着酷暑，在茫茫的沙漠中茁壮的成长…………………………（也扯长点）