题目

同温同压下，相同体积的SO2和CO2：①质量相等；②密度相等；③分子数相等；④氧原子数相等；⑤电子数相等，其中正确的是（ ）A.①②③④ B.②③④⑤ C.③④ D.③⑤ 答案：【答案】C【解析】同温同压下，气体体积之比等于其物质的量之比，因此同温同压下，相同体积的SO2和CO2的物质的量相同，因此所含分子数、氧原子数相同，二者的摩尔质量不同，根据m=nM可知，二者的质量不同，根据可知，二者的密度不同，CO2和SO2中电子数分别为22、32，因此二者所含电子数不同，综Cloze 5(2015辽宁沈阳)       Last week,students at Rosie Bridge School worked hard to make their English Week very successful.      There 1   a lot of activities including an English book fair in the library and a treasure hunl. 2  students put on an English play.Other students 3  an English singing competition.     A speaking competition was also 4  . The students had to speak on a topic in English 5  two minutes.      Henry was the winner and we spoke to him.t4Fm so happy that I 6  ”he said/M advise people to speak slowly. 7  they want to be good public speakers,they'd better speak clearly and 8   .”      We also spoke to several other students about English Week. One of 9  was Amy.      “I really enjoyed English Week. It gave me a chance to learn new 10  In my opinion,every school should have an English Week.it's well 11  doing ,”she said.      On the last day of English Week,the head teacher gave a 12   to the whole school. He gave students some suggestions on 13  to improve their English.“ You should communicate in English with your friends whenever you 14  . You should read English books and maga?zines,and watch English television 15  . Above all,you should enjoy English!”he said.   1.A. are   B. were   C. is   D. was   2.A. Some   B. No   C. A11   D. Few   3.A. took in   B. took place   C. took part in   D. took care of   4.A. playing   B. played   C. holding   D. held   5.A. on   B. at   C. for   D. by   6.A. did   B. won   C. lost   D. had   7.A. Although   B. Since   C. Until   D. If   8.A. confidently   B. quietly   C. quickly   D. patiently   9. A. us   B. you   C. them   D. others   10.A. abilities   B. words   C. friends   D. books   11.A. enough   B. known   C. dressed   D. worth   12.A. speech   B. decision   C. task   D. help   13.A. where   B. how   C. whether   D. when   14.A. must   B. need   C. should   D. can   15.A. programmes   B. parts C. stars   D. stations