除当日新开仓位外，当某期货合约以涨跌停板价格成交时，成交撮合实行（）原则。

M: It seems the restaurants here have little business these days. W: That’s true, but ours is a scenic resort and this is not the busy season. When summer comes, you’ll see armies of tourists waiting in line in order to get a seat. Q: What do we learn about the restaurants from the conversation?（）

A．They cater chiefly to tourists.
B．They are busy all the year round.
C．They stay closed until summer comes.
D．They provide quality service to their customers.

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上海期货交易所的（）期货合约允许采用厂库标准仓单交割。

A．螺纹钢
B．线材
C．豆粕
D．棕榈油

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