代词类题目求解释。。谢谢

maming99

请教各路高手， 当一句话的代词做主语时，应该优先指代另一句话的主语。如果不能指代主语时，也可以指代其他名词。那么当代词不做主语时优先指代什么呢？？含有代词的题目应该注意什么啊。。
还有下面的一个题目求解释    本题选C  但是D 为什么不对 In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.
(A) in effect manufacturing its own antifreeze
(B) effectively manufacturing antifreeze of its own
(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze
(E) thus the manufacture of its own antifreeze



In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.
(A) in effect manufacturing its own antifreeze
(B) effectively manufacturing antifreeze of its own
(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze
(E) thus the manufacture of its own antifreeze



当一句话的代词做主语时，应该优先指代另一句话的主语。如果不能指代主语时，也可以指代其他名词。那么当代词不做主语时优先指代什么呢？？含有代词的题目应该注意什么啊。。
还有下面的一个题目求解释    本题选C  但是D 为什么不对 In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.
(A) in effect manufacturing its own antifreeze
(B) effectively manufacturing antifreeze of its own
(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze
(E) thus the manufacture of its own antifreeze



In cold-water habitats, certain invertebrates and fish convert starches into complex carbohydrates called glycerols, in effect manufacturing its own antifreeze.
(A) in effect manufacturing its own antifreeze
(B) effectively manufacturing antifreeze of its own
(C) in effect manufacturing their own antifreeze
(D) so that they manufacture their own antifreeze
(E) thus the manufacture of its own antifreeze

mslancaster

仅考虑代词指代，CD都是对的。
Here we should focus on the difference between"in effect maufaturing...." and the clause introduced by "so that"

(C)强调an unintended 的过程,一个自然而言形成的结果.
(D)强调主观意动..indicates that the fish and invertebrates are actively trying to produce this internal "antifreeze", and actively process the carbohydrates in such a manner as to achieve that goal.

-- by 会员 Gail小M (2011/4/6 23:26:54)

D就是因为代词错的

D的they可以就近指代glycerols，因为也是复数形式。而C由于分词作状语，their只能指代逻辑主语fish and invertebrates.

wlf1987

，so that 意思是所以；D项这里应该不加逗号

Gail小M

仅考虑代词指代，CD都是对的。
Here we should focus on the difference between"in effect maufaturing...." and the clause introduced by "so that"

(C)强调an unintended 的过程,一个自然而言形成的结果.
(D)强调主观意动..indicates that the fish and invertebrates are actively trying to produce this internal "antifreeze", and actively process the carbohydrates in such a manner as to achieve that goal.