3 B+ W7 f+ O1 t' }* D4 X答案下期揭晓作者: ludy 时间: 2012-3-21 15:15
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to always kow about the most recent changes or developments in a particular situation or activity." ?8 S9 D3 f7 J4 Q) F! {" q
e.g. * a; U' f* r' m6 Q8 b: v- [% Gpeople with their finger on the pulse of fashion and pop culture.