Dear Betty,

    I'm your eraser Jill. This afternoon you lost me in your classroom. Simon found me and gave me to your English teacher Ms. Green. Now Ms. Green's three keys and I are in Ms. Green's bag. The bag is yellow. It's on Ms. Green's desk. Please call Ms. Green at 718-0167 and ask her for me. You can come to the library, too. Ms. Green is in the library now.

Jill

阅读短文，回答问题。

大海边

     今天，爸爸和我一起到大海边玩。

     我在沙滩上走来走去，身后留下一串串脚印。浪花一波一波地打在脚上，我都快要站不住了。浪花一朵一朵在海面上开放，美丽极了。我还看到一群小鱼在水中游来游去，真是有趣呀！

爸爸说：“大海是船儿的道路。”

我说：“大海是鱼儿的家。”

近年来我国际上经常出现粮食危机，甚至在一些国家出现粮荒．粮食作为人体的营养物质，发挥着重要作用．下面请同学们根据大米在人体内的主要变化，完成下列各题：