单项选择题 （ ）The writer suggests that Catch-22 is________.．A.a very great English novelB.an accurate portrayal of life in wartimeC.an excellent piece of satireD.the work of a neglected author

单项选择题 自养微生物的生物氧化包括发酵、有氧呼吸、无氧呼吸。 A、正确 B、错误

单项选择题 “I saw Mary in the library yesterday?” “You_________her，she is still in hospital．”A.can’t have seenB.mustn’t have seenC.could not seeD.must not see