Since the global financial crises , the export of Chinese goods has managed to ____ roughly, and now everything goes well in foreign trade.

A．close up

B．keep up

C．add up

D．hold up

柳永的《望海潮·东南形胜》写道：“重湖叠巘清嘉，有三秋桂子，十里荷花。”请问词中的“重湖”是指什么湖？