S8. The melted rocks fly into the air by ________________.

A．Because the smokers fad became a habit that had to be fed.
B．Because more and more people were involved in planting tobacco and selling it.
C．Because people believed that smoking could develop one’s brain.
D．Because smoking spread to all parts of the world.

A．They charge no money for people who buy automobile insurance.
B．They encourage people to buy automobile insurance.
C．They provide financial support for driver education.
D．They share in appreciation of the importance of the driver education.