【单选题】下面有几段文章,每一个段落均需要一个句子表达其中心思想,这个句子就是主题句。你应很快地从三个供选择的答案中挑选出适宜的主题句来。 Paragraph 1 Complete proteins,which the body needs for growth,have all the essential amino acids; meat,fish,poultry,eggs,milk,and chees...
A.
There are many ways to cook meat and grains.
B.
There are two kinds of proteins: complete proteins and incomplete proteins.