如图所示，在水平路面上一运动员驾驶摩托车跨越壕沟，壕沟两侧的高度差为0.8m，水平距离为8m，则运动员跨过壕沟的初速度至少为（取g=10m/s²）（   ）

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Mike is an Englishman. He lives in a 1 building in the 2 London. There are eighteen floors in the building and he lives on the fifteenth floor. He 3 a lift (电梯) to go up and down. He works very hard. He 4 to work early. Every day he leaves his     5 and walks to the lift. He gets into the lift. It  6 him down to the first floor. He gets out of the lift. Then he 7 to a bus stop. The bus stop is in front of a station. It is about two hundred meters from his home. 8, he catches the No. 11 bus to work. But sometimes he goes by bike. He works in a factory about ten 9 from his home. His work 10 at half past eight. And finishes at a quarter to five. He gets back home at half past five.

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