第三节One possible version:Chinas shared bicycles are gaining popularity withthe public as a cheap and convenient transport optionBike-sharing helps people enjoy an environment-friendlylife by relieving traffic and reducing pollution. Howeverthe bad behavior of some users and the mess they cause alsolead to some problems. Beijing has launched a campaignregulate bike-parking, which will hopefully set a goodexample to the rest of China

17.(13分)(1)氢(1分)氧(1分)硅(1分)2):06:C:0:(2分)(3)①CH4(2分)②CO(2分)③C2H4(2分)④H2O2(2分)【解析】由题可知,X为H,Y为O,Z为S,M为CN为S。(1)X、Y、Z三种元素的名称分别为氢、氧、硅。(2)二氧化碳的电子式为6:C::(3)由H、O、Si、C、S五种元素两两组成的分子中,含10e且呈正四面体结构的分子为CH4;含14的双原子分子为CO;含16e且能使溴水褪色,说明分子中含有不饱和键或分子具有还原性,该分子为C2H4;含18e且常温下呈液态的分子为H2O2

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