中国大学MOOC: Speed limits are generally higher on freeways and are occasionally nonexistent.
举一反三
- 中国大学MOOC: Speed limits could rise with more people using self-driving cars. When self-driving cars prove they can 6) ______ at higher speed limits, speed limits could be raised.
- 中国大学MOOC: Fewer accidents mean _______ traffic conditions, and reducing 5)_______, repairs and injuries. Speed limits could rise with more people using self-driving cars.
- 中国大学MOOC: The higher the water turbulence such as wave action, the higher the relative number of:
- During which period could British motorists drive without speed limits
- 中国大学MOOC: As they moved higher up, their voices _______.