题目

如图，这是农民采用的笼养蝇蛆法而形成的食物网．（说明：鸡粪中含有较多的营养物质未被消化，因此，可添加其他饲料养猪，从生态系统的角度来看，这是一个理想的生态系统）请分析，并回答有关问题． （1）构成此生态系统，不可缺少的生物成分是． （2）建立此生态系统的目的是：． （3）在这个生态系统中，农作物所属的成分是． （4）人们为了使农作物高产，常喷洒农药来消灭农田害虫，这残留的农药会通过在人体中富集． （5）Nowadays we call see more and more electric bikes hi the street. Electric bikes are easy to  41  and they can run faster than ordinary bikes. So they become very  42  in many cities in China now. But the electric bikes also  43 many traffic accidents happen. So the Chinese government plans to make a new   44  for the electric bike riders(骑车者). If  45   electric bike is heavier than  40 kilos and it can go   46  than 20 kilometers an hour, its rider must get a license (执照). It means riders have to pass driving test  47 __ they ride their electric bikes on the road. People have different ideas about the rule. Some people like the rule  48   they think it will make the street much safer. But some people are not  49 the new rule at all. One rider said, "I don' t want to get a license or   50  , I don' t like too many rules in life. " What' s your idea, my friends?【小题1】A．listenB．rideC．playD．bring【小题2】A. popular            B. hard          C difficult           D dangerous【小题3】A．shareB．throwC．protectD．make【小题4】A．messageB．adviceC．ruleD．letter【小题5】A．aB．anC．theD．/【小题6】A．fasterB．fastC．fastestD．slowly【小题7】 A. during           B. after             C. before       D in【小题8】A．soB．becauseC．butD．and【小题9】A．happy withB．worried aboutC．sorry aboutD．surprised at【小题10】A．somethingB．nothingC．everythingD．anything