中小型立式加工中心常采用（）立柱。A、螺旋型 B、圆柱凸型 C、断面 D、固定式空心

smoking  stop  unhealthy  allowed  badly started  easily  living  thought  named

Tang Ling often smoked cigarettes(香烟) in his school’s washing room. He  1  smoking at the age of 14. One day he learnt that the NBA star Yao Ming, an ambassador(大使) to the Chinese Association on Tobacco Control (中国控烟协会), asked people not to smoke. Yao Ming was Tang’s favorite star, and his words meant a lot to him. He decided to give up  2  .
According to the Chinese Association on Tobacco Control, about 350 million Chinese smoke.  Among them, 50 million are teenagers. Sun Jiangping of Beijing University said, “ Teenagers can get cigarettes  3  , especially when their parents smoke or shops sell cigarettes to them. It’s very important for parents to help their children  4  smoking.”
A 15-year-old boy  5  Li Kun from Beijing said his parents didn’t smoke. Because they  6  smoking could make people feel  7  ill, they only  8  him to play with friends without smoking.  9  in such a good family helped Li say no to cigarettes. Some of his smoking classmates once told Li that smoking made boys look cool, but Li disagreed. He said, “Smoking is  10  and it’s not cool at all. Please stop smoking now!”