The faculty of the university boasts some of the world’s （）

A．They account for 70％of all deaths．
B．They are responsible for most of the health care costs．
C．They often result in unhealthy lifestyles．
D．They are largely preventable．

A. Recently，though，scientists changed their opinion after they studied a large group of nonsmokers．
B. The Gilsons have been married for 35 years．
C. 111is smoke is called secondhand smoke．
D. However, secondhand smoke is dangerous to all people，old or young．
E. As a result，they have passed laws which prohibit people from smoking in many public places． ．
F. In the United States，nine million children under the age of five live in homes with at least one smoker．