F.4英文作文要作關於食物??

For food, you can use certain types of vocabularies such as cereal products
eg:Ideally, we should eat more cereal products in order that they can increase one's intake of fibre,since there is some evidence to prove that these really reduce the risksof certain cancers./Eat sufficient amount of protein-contained food because protein can used for body denfence and make our muscle even stronger.
關於取分技巧是很難給予你意見的,因為本人不知道你想作 article/speech/personal letter/letter to the editor,as a result,different writing styles are needed.