[单选题]—?Got your driving license— No. I _____ too busy to have enough practice, so I didn"t take the driving test last week.A. was B. have beenC. had been D. am
[单选题]正确记录实验数据是一项实验基本技能,某同学记录的实验数据错误的是( )A.用托盘天平称取2.9gNaCl固体B.用10mL量筒量取8.3mL蒸馏水C.向50mL小烧杯中倒入约20mL蒸馏水D.用体温表量得某学生体温37.66℃
[单选题]When I talked with my grandma on the phone,she sounded weak,but by the time we up,her voice had been full of life. [ ]A.were hangingB.had hung C.hungD.would hang
[单选题]下列有关煤、石油的说法正确的是( )A.石油裂解得到的汽油是纯净物B.石油分馏和煤干馏都是化学变化C.煤干馏可以得到甲烷、苯和氨等重要化工原料D.水煤气是通过煤的液化得到的气体燃料
[单选题]在“十二五”期间,江苏省将大力实施“清水蓝天”工程.下列不利于“清水蓝天”工程实施的是( )A.积极推广太阳能、风能、地热能及水能等的使用,减少化石燃料的使用B.加城市生活污水脱氮除磷处理,遏制水体富营养化C.加大稀土资源的开采和出口,保证经济快速发展D.大力实施矿物燃料“脱硫、脱硝技术”,减少硫的氧化物和氮的氧化物污染
[单选题]I ____ along the street looking for aplace to park my car when the accident _____. [ ]A. went; was occurring B. went; occurred C. was going;occurredD. was going; had occurred
[单选题]下列不属于蛋白质变性的是( )A.鸡蛋清中加CuSO4后产生沉淀B.病人注射前用医用消毒酒精进行消毒C.往蛋白质溶液中加入浓硝酸会出现沉淀D.往蛋白质溶液里加入食盐使之变浑浊
[单选题]If only I could have helped you! But I really _____ no good idea how.[ ]A.have B.had C.have had D.had had
[单选题]小苏打常用于治疗胃酸过多,小苏打属于( A.酸B.碱C.盐D.氧化物
[单选题]下列做法与社会可持续发展理念相违背的是A.将作物秸秆通过化学反应转化为乙醇用作汽车燃料B.使用资源节约型、环境友好型的生物降解塑料包装袋C.大力研发新型有机溶剂替代水作为萃取剂D.利用CO2合成聚碳酸酯类可降解塑料,实现“碳”的循环利用
[单选题]下列物质中不属于合金的是[ ]A.硬铝B.钢铁C.青铜D.金箔
[多选题]化学与工农业生产、人类生活都有密切相关,下列说法中正确的是A.CO2和CH4都是造成温室效应的气体B.石油裂解、煤的气化、海水制镁等过程中都包含化学变化C.铝合金的大量使用归功于人们能使用焦炭等还原剂从氧化铝中获得铝D.海水中含有钾、钠元素,只需经过物理变化就可以得到钾和钠单质
[单选题]误食重金属盐后,应采取有效急救措施是( )A.注射大量生理盐水B.服用大量生理盐水C.服用催吐剂D.服用豆浆或牛奶
[单选题]—Hello, I ________ to ask if I can book two tickets for tonights film.—Sorry, weve already sold out.[ ]A. phoneB. will phoneC. am phoningD. have phoned
[单选题]下列说法中正确的是A.医用酒精的浓度通常为95%B.单质硅是将太阳能转变为电能的常用材料C.淀粉、纤维素和油脂都属于天然高分子化合物D.合成纤维和光导纤维都是新型无机非金属材料
[单选题]— You were not in when I dropped in on you yesterday evening.— Oh, so sorry. I ____ at the railway station for my sister from Beijing. [ ]A. waited B. had waitedC. was waiting D. have been waiting
[单选题]“绿色化学”的主要内容之一是指从技术、经济上设计可行的化学反应,使原子充分利用,不产生污染物.若以铜为原料制取硫酸铜或硝酸铜,下列设计你认为符合“绿色化学”思想的反应路线(用化学方程式表示)是A.制CuSO4:Cu + 2H2SO4(浓) = CuSO4 + SO2↑+ 2H2OB.制CuSO4:2Cu + O2= 2CuO; CuO + H2SO4(稀) = CuSO4 + H2OC.制Cu(NO3)2:Cu + 4HNO3(浓)=Cu(NO3)2 +2NO2↑+ 2H2OD.制Cu(NO3)2:3Cu + 8HNO3(稀)=3Cu(NO3)2 +2NO↑+ 4H2O
[单选题]2009年6月5日是第38个世界环境日,我国环保总局确定的主题是“人人参与,创建绿色家园”.下列措施不符合这一主题的是[ ]A.推广垃圾分类存放,分类回收,分类处理 B.改革传统采煤时将煤层气直接排入空气的做法,先开采和综合利用煤层气,然后再采煤 C.推荐使用手帕,尽量减少使用面纸 D.将工厂的烟囱造高,以减少工厂围的大气污染
[单选题]The hotel wasnt particularly good. But I _____?in many worse hotels.A. was stayingB. stayedC. would stay D. had stayed
[单选题]Don’t call me up at this time tomorrow, for I _______ an important test.A.will takeB.am takingC.have been takingD.will be taking
[单选题]The hunter ____ down and ____ to the farmer that he had___ his gun against the tree. [ ]A. lay, lied, laidB. lay, laid, laidC. laid, lay, lied D. laid, lied, lay