题目

下列哪种物质的形成与内质网及上面的核糖体、高尔基体和线粒体都有关 A．血红蛋白 B．呼吸氧化酶 C．胃蛋白酶原 D．性激素 答案：【答案】C【解析】核糖体是合成蛋白质的场所，其上蛋白质合成以后，由内质网、高尔基体进行加工，整个过程需要线粒体功能。由此可见该物质为分泌蛋白，故选CWorries about school bus safety have drawn much attention. Now schools in some poor areas are looking   41  some other ways to go to school. In the countryside, students are living in different places. And there isn’t enough   time for school buses to go around and pick up   42  student. So the most useful way is to let students living in the   43  village take a special school bus which is for them only. And the cost is   44  by their parents and the school. Each bus is asked to carry only five students on the same route(路线) every day. Traffic police are also making daily checks to make sure drivers don’t carry__45  than 5 students. For a bus like this, the drivers can   46  make any money. So schools pay 300 yuan to drivers every month. The rest comes from the parents’ pockets（口袋）.The roads to the students’ homes are rough(崎岖的) and sometimes even dangerous,   47  falling rocks and narrow（狭窄的） bridges. After spending at least an hour on the road, the students finally make it home.   48 the money for taking a bus has increased and it’s not easy for parents to make money, they are glad to know that their children will   49  home safely each day. And they feel happy to see their child enjoy their time at school. But one girl says she’s seen the big yellow school   50  on TV, and wonders when she’ll ride one of her own. 【小题1】A．atB．up C．forD．through【小题2】A．allB．everyC．bothD．either【小题3】A．nearB．farC．sameD．poor【小题4】A．boughtB．spentC．paidD．took【小题5】A．fewB．fewerC．manyD．more【小题6】A．alwaysB．oftenC．sometimes D．hardly【小题7】A．andB．butC．withD．without【小题8】A．BecauseB．AlthoughC．IfD．When【小题9】A．getB．arrive atC．arrive inD．reach to【小题10】A．desks B．bags C．buses D．bikes