单项选择题

What is true of robotic drivers

A．It will take some time before robotic drivers can be put to practical use．
B．Robotic drivers are not allowed to drive on busy roads．
C．Robotic drivers can never replace human drivers．
D．Robotic drivers are too expensive to use．

<上一题目录下一题>

热门试题

单项选择题

According to the last two paragraphs，what did the previous researchers think about the hu—man eye’s light—sensing system

A．The human eye had two light—sensing systems．
B．The human eye had one light—sensing system．
C．The human eye could sense the light of day more quickly than the dark of night．
D．The human eye could reset our internal clocks in accordance with the alarm clocks．

单项选择题

The salt concentration in the liquid water of Lake Vida__________.