阅读理解

   Everybody wants to be healthy. You know food is very important. There are lots of healthy food. You can have more bananas, apples, oranges, tomatoes and lettuce because fruit and vegetables are good for you. But don’t eat too much chocolate. It’s not healthy food. Healthy food can make you grow (生长) and make you strong（强壮的） and happy. Remember there is a saying—“An apple a day keeps the doctor away（远离）”. Sports can also keep you healthy. Get up early and do some sports every day. Don’t be lazy（懒惰的）. You will be healthy and happy.

唐太宗曾说：“此木虽曲，得绳则正；为人君虽无道，受誎则圣。”这说明他（    ）

【提出问题】为什么会生成淡黄色固体？