19. In addition to having more protein than wheat does, the protein in rice is higher quality than that in wheat, with more of the amino acids essential to the human diet.
(A) the protein in rice is higher quality than that in
(B) rice has protein of higher quality than that in
(C) the protein in rice is higher in quality than it is in
(D) rice protein is higher in quality than it is in
(E) rice has a protein higher in quality than
choices A, C, and D illogically compare wheat with protein and claim that the protein in rice has more protein than wheat does. In C and D, the comparative structure higher in quality than it is in wheat absurdly suggests that rice protein contains wheat.
明白A C D的共同点是比较主体错误，可是不明白为什么解释中又加了一句，In C and D, the comparative structure higher in quality than it is in wheat absurdly suggests that rice protein contains wheat.
这句话好像在说假如C D的比较主体正确的话，另外还有一个是由比较结构导致的错误，是C D有而A所没有的错误，就是suggests rice protein contains wheat，我怎么也看不出这是怎么样理解出来的，请各位同学帮忙解答一下； | 
