单项选择题

Supply of petroleum is subject to dramatic ups and downs （）.

A.in the long run
B.in the long roads
C.in the long rounds
D.in the short run

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单项选择题

And （）will generate excessive vehicle production capacity.

A.blind investment
B.blind invests
C.blind investor
D.invest

单项选择题

Iraq revived the F-16 deal because（）

A.they had stored enough food supplies.
B.they made much money on oil trade.
C.U.S.offered them an attractive discount.
D.they passed a bill on setting up its air force.