Look! There are some black round things in the pond. What are they?
Oh! They are frogs eggs. Look at this egg. It's smooth, soft and very small just like a little black bean. After several weeks, its tail comes out. It's long. We call it tadpole. It likes to eat water fleas. And after 6-9 weeks, its back legs appear. Later, its front legs appear. This tadpole is getting bigger and bigger. At last, its tail disappears, and it becomes a little frog with green skin.
Frogs eat pests. They protect plants. Also They're helpful to our human beings, so we must protect them. They are our friends.
点评
本篇描写了青蛙的生长过程，从卵—蝌蚪—青蛙，其间的变化一一交代清楚，可见小作者平日观察的仔细到位。最后一段内容旨在提高立意，以唤起人们保护动物的意识。青蛙是益虫，我们应该好好保护它们。全文时态统一，简洁流畅，意味深长，值得借鉴。
重点表达
1．It's smooth, soft and very small just like a little black bean. 它光滑柔软，小得就像一颗小黑豆。
2．After several weeks, its tail comes out. 几星期后，它的尾巴长出来了。
3．We call it tadpole. 我们叫它蝌蚪。
4．Its back legs appear 它的后腿出现了。
5．This tadpole is getting bigger and bigger. 这个蝌蚪越长越大。
6．At last, its tail disappears,最后，它的尾巴消失了。
7. Also They're helpful to our human beings, so we must protect them. 他们也对于我们人类有益处，所以我们必须好好保护它们。