Today our knowledge of food and what it dose for our bodies is more advanced than that in the past

Today our knowledge of food and what it dose for our bodies is more advanced than that in the past

题目
Today our knowledge of food and what it dose for our bodies is more advanced than that in the past
为什么要用is,而不是are?不是两个并列成分吗?
答案
并列 结构 在 of 后 共同修饰 knowledge,- knowledge 是主语
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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