单项选择题
A．the policy makers to feel very worried and careful B．the scientists to work harder C．many people to find work easily D．a lot of companies to produce many new drugs
A．Never drive faster than 30 miles an hour. B．Try your best to save yourself in a car accident. C．Never forget to wear the safety belt while driving. D．Drive slowly while you"re not wearing a safety belt.
A．none B．one C．no D．neither