单项选择题

A．The benefits of strong business competition.
B．A proposal to lower the cost of production.
C．Complaints about the expense of modernization.
D．Suggestions concerning new business Strategies.
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假设朋友Gary邀请你参加一个聚会，但你因故不能参加，写信向他说明原因，并祝聚会成功。
单项选择题
According to the passage, static electricity can be caused by ______.
A．using home-made electrical goods
B．wearing clothes made of natural materials
C．walking on artificial floor coverings
D．sorting food in a refrigerator
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