蓝色是我做的，红色是正确答案，请大家指教！
5. Carbon-14 dating reveals that the megalithic monuments in
(A) as old as any of their supposed
(B) older than any of their supposed 不改变原文意思吗？
(C) as old as their supposed
(D) older than any of their supposedly（B）
(E) as old as their supposedly
17. Native American burial sites dating back 5,000 years indicate that the residents of
(A) were part of a widespread culture of Algonquian-speaking people
(B) had been part of a widespread culture of people who were Algonquian-speaking
(C) were people who were part of a widespread culture that was Algonquian-speaking
(D) had been people who were part of a widespread culture that was Algonquian-speaking（A）
(E) were a people which had been part of a widespread, Algonquian-speaking
culture
Residents 可以是 part of culture?
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（B）
(E) rice has a protein higher in quality than has Correct?
mm可以搜一搜以前的讨论。。。
如果你不懂怎么搜索，可以看一看置顶贴，看讨论很有帮助的。。。
谢谢singledream, it really helps!
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