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【单选题】
5月份，某进口商以67000元／吨的价格从国外进口一批铜，同时利用铜期货对该批铜进行套期保值，以67500元／吨的价格卖出9月份铜期货合约，至6月中旬，该进口商与某电缆厂协商以9月份铜期货合约为基准价，以低于期货价格300元／吨的价格成交。 据此回答以下两题。 该进口商开始套期保值时的基差为（ ）元／吨。 查看材料A.
300
B.
-500
C.
-300
D.
500
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【单选题】Finding her car stolen, ______. [ ]
A.
a policeman was asked to help
B.
the area was searched thoroughly
C.
it was looked for everyone
D.
she hurried to a policeman for help
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