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We hear it a lot the news these days: 'Recycle newspapers and save a tree. Collect bottles and cans so they can be reused in the manufacturing of new products.' Protecting our delicate environment seems to be on the agenda of politicians, government leaders, and citizens in many parts of the world to show support for mother nature. The concept of green consumerism has gained momentum more and more over the last decade, and the public feels moved to pitch in and help. However, three essential keys needed to power this movement include a more informed public, the development of improved technology, and a greater demand for recycled materials. Let's use paper as an example. The first step is to raise public awareness about the recycling process, explain the kinds of materials that can be recycled, and provide ways on how to properly dispose of them. Local governments should educate the public on how to properly sort reusable materials from those, like waxed paper, carbon paper, plastic laminated material such as fast food wrappers, that can't be recycled very easily. Then, a system of collecting these sorted materials needs to be established. Public interest might be there, but may soon wane if recycling centers located in convenient locations are not available. Sometimes we become complacent when it comes to recycling, but when you speak in terms of actually facts and figures that everyone can understand, people become more cognizant of the problem. I remember reading one time that the energy saved from one recycled can provide enough power to operate a television set for three hours. Give the public information they can grasp in real terms, and then you will increase your chances of gaining followers. Second, technological progress has been made on many fronts, but governmental agencies need to step up their support for companies involved in recycling by providing tax incentives, low - cost loans, or even grants to upgrade equipment and to encourage further research. One breakthrough has been the development of a new manufacturing process that uses enzymes to help remove ink from paper in more energy efficient and environmentally safe methods. Recycling paper materials can be expensive in both monetary and environmental terms. The difficulty in removing print from paper, the amount of energy expended during the process, and caustic waste that is sometimes produced are costs that companies incur that are then passed onto the consumer. The final key is to increase demand for the growing surplus of resources waiting to be recycled. This problem has appeared in various regions of the world where the technology to process the used materials lags far behind the amount being collected for recycling. There may be a great outpouring of support yet the great stumbling block to implementing the second stage of this plan could be thwarted by the corporate sector's inability to find commercial enterprises interested in using recycled goods especially when the cost of exceeds those of virgin materials. Recycling is a crucial link protecting our planet. The three keys mentioned are important to achieving this end. What would be the best title for this passage?
A.
Important Keys to Recycling Paper
B.
Technological Advances Improve Recycling
C.
Steps to Improving Recycling
D.
Best Ways to Protect Our Environment
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【简答题】某校为迎接市春季运动会,从5 名男生和4名女生组成的田径 队中选出4人参 加比赛,要求男、女生都有,则男生甲与女生乙至少有1人入选的方法总数为 ___ 。
【单选题】下列关于元素周期表的描述正确的是( )
A.
有7个周期,18个族
B.
元素周期表中最右上角元素的非金属性最强
C.
元素种类最多的族为第IIIB族
D.
在元素周期表的过渡元素区域中寻找制半导体材料的元素
【多选题】小L 是一名资深IP 网络专家,立志要开发一种新的动态路由协议。而一个路由协议的工作过程应该包括如下 哪些?
A.
发现邻居
B.
交换路由
C.
计算路由
D.
维护、更新路由
【简答题】某班级要从4名男生、2名女生中选派2人参加某次社区服务,如果要求男、女生各1名,那么不同的选派方案种数为______.
【判断题】示波器荧光屏上显示的曲线是电子束在输入信号的作用下在荧光屏上的运动轨迹。
A.
正确
B.
错误
【判断题】示波器荧光屏上显示的曲线是电子束在输入信号的作用下在荧光屏上的运动轨迹。
A.
正确
B.
错误
【多选题】小L 是一名资深IP 网络专家,立志要开发一种新的动态路由协议。而一个路由协议的工作过程应该包括如下哪些?(选择一项或多项)
A.
查找路由表并转发数据包
B.
交换路由信息
C.
计算路由
D.
维护、更新路由
【单选题】根据元素周期表和元素周期律,判断下列有关描述正确的是 [     ]
A.
碱金属元素中,金属活泼性最强的是Li
B.
第三周期元素中,原子半径最大的是Cl
C.
短周期元素氧化物对应的水化物中,酸性最强的是H 2 SO 4
D.
所有元素的气态氢化物中,最稳定是HF
【单选题】对降钙素的正确描述是:
A.
不参与钙及骨质代谢
B.
属多链多肽类激素
C.
从甲状腺β细胞分泌
D.
临床应用的均为鱼降钙素
E.
由64个氨基酸所组成
【简答题】某组有16名学生,其中男、女生各占一半,把全组学生分成人数相等的两小组,求每小组里男、女生人数相同的概率.
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