> Hello I am simon from hong kong,
> I want to know how can I grab the link 
> <http://library.thinkquest.org/C001146/>
> which directs you to a page on the same domain

This site is checking the referer HTTP header as sent by the browser (bah,
stupid).  Try this:  Point HTTrack at this URL:

<http://www.thinkquest.org/library/lib/site_sum_outside.html?tname=C001146&url=C001146/>

Then in the Filters, add:

+library.thinkquest.org/C001146/*