单项选择题

Non-human cars are often called _______.‏

A．robot cars
B．autonomous cars
C．driverless cars
D．self-driving cars

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The industry life cycle includes five stages, including the beginning stage, the growth stage, the shock stage, the maturity stage and the decline stage.

答案：正确

单项选择题

脂肪变性最主要见于（）
A、心
B、肾
C、肝
D、肺