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【单选题】
But we must also consider the impact of the new technology on those who now depend on driving for their livelihood. According to the U.S. Department of Labor, in May 2015 there were 505,560 registered school bus drivers. The American Trucking Associations lists approximately 3.5 million professional truck drivers in the U.S. The companies developing self-driving vehicles should be partnering with state and federal authorities to offer retraining for this massive workforce, many of whom will be displaced by the new technology. What would be the negative impact of driverless cars?A.
The conflict between labor and management would intensify.
B.
The gap between various sectors of society would be widened.
C.
Professional drivers would have a hard time adapting to new road conditions.
D.
Numerous professional drivers would have a find new ways of earning a living.
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【简答题】共享经济的实质是什么，你还可以举出除了租车之外的其他例子吗？
【简答题】如图所示，已知抛物线y 2 =2px（p＞0）的焦点恰好是椭圆 x 2 a 2 + y 2 b 2 =1 的右焦点F，且两条曲线的交点连线也过焦点F，则该椭圆的离心率为______．
【单选题】已知抛物线x 2 =2py（p＞0）的焦点F恰好是双曲线 y 2 a 2 - x 2 b 2 =1 的一个焦点，且两条曲线交点的连线过点F，则该双曲线的离心率为（ ）
A.
2
B.
1± 2
C.
1+ 2
D.
无法确定
【简答题】已知抛物线y 2 =-2px（p＞0）的焦点F恰好是椭圆 x 2 a 2 + y 2 b 2 =1 的左焦点，且两曲线的公共点的连线过F，则该椭圆的离心率为______．
【简答题】已知抛物线y 2 =2px（p＞0）焦点F恰好是双曲线 x 2 a 2 - y 2 b 2 =1 的右焦点，且两条曲线交点的连线过点F，则该双曲线的离心率为______．
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