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(B) more as… than the dollar，the dollar 和前面比较对象有歧义。
(C)正确，介词短语 a substitute for… more than for…形式上并列。
(D) more than 后面省略介词 for 使句子产生歧义;it 没有指代对象，根据句意 it 应该指 weight，不能指代 its weight，因为原句是将 dollar 的 weight 和 for quarter 的 weight 进行比较，两个 weight 不同，如果用 it 指代，则不符合逻辑。
(E) more… rather than 搭配错;it 没有指代对象，根据句意 it 应该指 weight，不能指代 its weight
14. Many population studies have linked a high-salt diet to high rates of hypertension and shown that in societies where they consume little salt, their blood pressure typically does not rise with age.
(A) shown that in societies where they consume little salt, their
(B) shown that in societies that have consumed little salt, their
(C) shown that in societies where little salt is consumed,
(D) they showed that in societies where little salt is consumed,
(E) they showed that in societies where they consume little salt, their
(A) they和their没有指代对象。
(B) that引导的定语从句修饰就近的名词societies，逻辑意思不合理;their没有指代对象。
(C)正确，where引导定语从句修饰societies。
(D) they指代对象不清楚(应该指代studies，但有指代rates的歧义)，而且多余，应该是主语studies后跟两个并列谓语have linked and shown。
(E)第一个they指代对象不清楚，而且多余，理由与D选项相同;第二个they和their没有指代对象(按照理解应该是“大众群体”)，与第一个they的指代对象不一致。
15. India, like Italy and China, has no single dominant cuisine: Indian food comprises many different styles of cooking, with each a product of their regional influences, from the fiery vegetarian dishes of the south to the Portuguese-influenced Goan cooking of the west, to the more familiar Mogul food of the north.
(A) with each a product of their
(B) with each as a product of its
(C) each products of their
(D) each a product of
(E) each products of
(A) with多余;each a product后面应该对应单数代词its，而不是their。
(B) with多余;as多余。
(C) each后面应该跟单数名词product，和单数代词its，而不是复数。
(D)正确，each+noun. +prep. 独立主格结构。
(E) each后面应该跟单数名词product
16. The population of India has been steadily increasing for decades, and it will probably have what is estimated as 1.6 billion people by 2050 and surpass China as the world's most populous nation.
(A) it will probably have what is estimated as
