单选题By the time she leaves the stage next month, she _____ for sixty years.A will have performedB has performedC will be performingD will perform
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单选题These model cars ______ in China in 2013.A are madeB were madeC makeD made
单选题实验室制取的CO2中常混有少许的水蒸气、HCl、H2S等杂质，把此混合气体按以下各组中排列的顺序通过3种试剂，其中能得到纯净、干燥的CO2的最佳方法是（ ）．A 硫酸铜溶液、碳酸氢钠饱和溶液、浓硫酸B 硫酸铜溶液、浓硫酸、碳酸氢钠饱和溶液C 浓硫酸、硫酸铜溶液、碳酸氢钠饱和溶液D 碳酸氢钠饱和溶液、硫酸铜溶液、浓硫酸
单选题The news quickly spread throughout the campus _____ he won the first prize in the competition.A whichB whatC thatD who
单选题Who wants to express “Keep looking for what you believe in”?A Michael Dell.B J.K. Rowling.C Bill Gates.D Steve Jobs.
单选题在现实生活中，有的人往往投机取巧，弄虚作假，不择手段地骗取荣誉。得不到荣誉就牢骚满腹、怨天尤人、嫉恨领导、埋怨群众；得到荣誉就沾沾自喜，向社会伸手，这类人往往具有（ ）。A 荣辱心B 虚荣心C 好胜心
单选题He will write to me as soon as he _____ home.A will have returnedB returnsC returnedD will return
