A. The Taiwan Province Strait is an important "maritime corridor" in China.

The Taiwan Province Strait runs east-west, which is the natural dividing line between Taiwan Province Province and Shanghai.

C Qiongzhou Strait is between Hainan Island and Leizhou Peninsula, connecting the Beibu Gulf and the waters outside the Pearl River Estuary.

The Bohai Strait runs east-west, running through the Bohai Sea and the Yellow Sea.

Correct answer: The east-west direction of the Taiwan Province Strait is the natural dividing line between Taiwan Province Province and Shanghai.