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第1题

) 5.0 Mary is always ready to help others when they are in trouble and she never ____ their requests. A) turns up
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第2题

蒸馏法处理氨氮时，要求碱性介质蒸馏，加入（）调节水样碱性。 （2.0分） 2.0 分 A、 NaOH B、 Na2CO3 C、 MgO
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第3题

) 5.0 It suddenly ____ to me that we could use a computer to do the job A) occurred B) happened C) took place
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第4题

) 5.0 We suggested ____ in hotels but the children were anxious ____ out. A) sleeping； to camp B) sleeping； campi
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