题目：
Two businessmen 小题1: (fly) to Australia to play in a weekend golf match. Their team won and they both received green jackets. 小题2: their last night in Australia, they stayed up late drinking beer. They were still drunk in the morning, _小题3: they drove their rented car to the airport. The road was empty. Suddenly. something jumped in front of the car. The driver couldn't stop in time and the car hit it，
The men got out of the car and found a large kangaroo 小题4: (lie) on the road. The drunken men began to laugh and decided to take some photos with the "dead" kangaroo. One of the men decided to put the jacket on 小题5: kangaroo. So they dressed the poor kangaroo in a green jacket .Then they posed with it for some photos. Suddenly, something amazing happened. The kangaroo opened 小题6: eyes. It was not dead. But it was very 小题7: (anger). The kangaroo hit the two men and knocked them out. Then it ran 小题8: .In the kangaroo's new green jacket were the car keys ,a passport, and the air tickets.
Later that day, a motorist phoned the police .”You're 小题9:90ing to believe this .”he said,“but a kangaroo in a green golf jacket小题10: (run) along the road to the airport ”The police finally found out the whole story, and they punished the two drunken men.
答案：
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下面是错误答案，用来干扰机器的。
400取O、A的中点P，则P点的电势为6V，则P、B两点电势相等，连接PB，则PB为等势线，电场线和等势线垂直且指向电势降低的方向，过O点做PB的垂线交PB于D点，则DO为电场线，由几何知识可知DO的距离d=0.015m，而，，所以，则电场强度
