2.为了养好蚕，小华买了三本关于养蚕的书籍，第一本162页，第二本148页，第三本138页，这三本书一共有多少页？（用简便方法计算）

2. 448页。

三、你养过蚕吗？读一读下面关于养蚕的小日记，了解养蚕的一些事情吧！
When I got home on Wednesday, my mother told me silkworms were going to silk. I was very excited!
Some silkworms have crawled already to the corner. I saw them twisting the bodies. There was already some thin white silk. My hands touched it gently, feeling it more tough than the spiderwebs! A few days later, when I woke up, the silkworms have made the cocoons! Some exquisite(精致的)，white and small oval(椭圆形的) eggs. I really liked them. Through the translucent(半透明的) cocoons, I could vaguely see the silkworms' busy figures! My heart cheered for them!
读完这则养蚕小日记，你是否也对养蚕充满了好奇？动手试一试，然后试着用英语写下你的养蚕小日记吧。

示例：
Last Monday, my mother bought me some little silkworms.
I put them in a small paper box, and fed them fresh mulberry leaves every day.
They eat leaves very quickly, and become bigger and bigger these days.
I often watch them crawl slowly on the leaves, they look very lovely.
I hope they can grow up healthily and make beautiful white cocoons soon.

本题为开放性英语写作题，要求结合养蚕的亲身经历，使用四年级已掌握的简单英语词汇，通顺连贯地记录养蚕过程中的所见所感，内容贴合日常即可，不需要使用超纲的复杂句式和生僻单词。