精选优质文档-倾情为你奉上Passages for Reading1. SmokingIt is known to all that smoking is bad for health. Scientific research show that smoking can lead to heart disease, cancer and other problem. The World Health Organization says diseases linked to smoking kill at least two million five-hundred-thousand persons each year.Still, many people find it difficult to stop smoking. One reason is that smoking usually becomes a habitual behavior, and habits, whether good or bad are not easy to be given
