How often did the small theater company do a new play

单项选择题A．A specialist in oil-spill prevention.B．A TV reporter.C．An oil company technician.D．The head of the oil company.

问答题尽管可能需要六年时间才能使销售收入达到 1万亿美元，但是从1万亿到2万亿美元则不会再用六年时间，而从2万亿到4万亿美元甚至用不了两年时间。