—Betty suggested going to the park instead of shopping this Saturday.

—That's right, because most shops in this town are _____ on weekends. [ ]

A. close

B. closed

C. open

D. opened

合同中数量条款为“500/MT，10% more or less, at seller's options”则卖方交货数量为( )时，不违反合同。

A．400/MT

B．449/MT或551/MT

C．550/MT到450/MT之间的任意数量

D．600/MT