HELP! TWO GRAMMAR QUESITONS

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1.  Lowell , Massachusetts, known as the "Spindle City" (since) 1822 (when) its first textile mills were built, (attracted) worldwide attention (as textile) center.

the answer is D. Why???????? Help!!!!


2. (Visibly) only through large telescopes , Pluto (has) a yellowish color , which indicates that (there is) very( little) atmosphere.

the answer is A. ???

[此贴子已经被作者于2003-4-8 5:52:21编辑过]

我有我可以

1 应该是as the textile center.特指（CENTER）
2 visible,相当于which is visible.which指代pluto,是吧？NOT SURE

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i am clear now . thanks your reply.

blueberrymm

i think the first one should be a texile center.
the second one i don't think it is visible,maybe Being visible