Beijing will create 100 smoke-free primary and middle schools as part of a China-UN program aimed at promoting health education and healthy behavior for the country’s 230 million primary and middle school students. The World Health Organization（WHO）will send experts to help organize the activities，and then the experience from the schools in Beijing will be spread to create more smoke-free places，according to newspaper reports. In smoke-free schools，activities will be organized to persuade teachers and students to give up smoking.The students’ parents will also be encouraged not to smoke in front of their children. Figures from the China National Health Education Institute show that 45 percent of the boy students in senior middle schools smoke cigarettes，while the rate for junior middle schools is 34 percent，reports say. Experts are worried that if no action is taken immediately，the rates will go up to 59 and 54 percent respectively by the year 2004. A report by the China National Health Education Institute says that there are now 350 million smokers in China，with about five million under the age of 18.And of the adult smokers，about 75 percent said that they took up smoking between 15 and 24. 51.In Beijing there will be one hundred primary and middle schools where_______. A.nobody is allowed to smoke B.everybody may smoke freely C.the teachers may smoke but the students mustn’t D.the teachers warn the students not to smoke 52.How many smokers are eighteen years old and above in China now? A.230 million.                     B.350 million.                     C.5 million.                  D.345 million. 53.According to the text，in our country_______. A.the number of the students in primary and middle schools who smoke is reducing year by year B.it is very serious that m ore and more primary and middle school children smoke C.there are no smokers among the teachers in primary and middle schools now D.most of the students in primary and middle schools ask their teachers to stop smoking 54.The UN will send experts to help create 100 smokers smoke-free primary and middle schools in Beijing because_______. A.the organization tried to find faults with our country B.smoking seriously does harm to the students’ health C.the smokers in primary and middle schools ask these experts to come D.the organization wants to express its friendship for the Chinese people 55.Which of the following sentences best expresses the main idea of the text? A.Smoke-free activities and health education in China. B.China will f orbid the students in primary and middle schools to smoke. C.The number of smokers in primary and middle schools is increasing. D.One should stop smoking when young.