Read this and answer the question. If the question is unanswerable, say "unanswerable".

Both the Shanghai Stock Exchange and the Shenzhen Stock Exchange suspended trading of companies based in southwestern China. Copper rose over speculations that production in southwestern China may be affected, and oil prices dropped over speculations that demand from China would fall.

Besides the Shanghai Stock Exchange, what other exchange suspended trading of southwestern China stock?
Shenzhen Stock Exchange