GWD29-24 比较中让人始终不能理解的地方，都来看看吧，肯定对大家很有用的！

zinniz

B. It correctly compares wild animals to livestock fed on grain and constructs the "less X and more Y" idiom correctly.

C compares wild animals to "that of" livestock... what is "that of" referring to? It also says "have less X and have more Y" - we don't need the second have. The first have can apply to both parts of the idiom.

http://www.manhattangmat.com/forums/according-to-recent-studies-comparing-the-nutritional-value-t718.html