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【单选题】
My wife and I were planning a trip to visit family in Ecuador. The cheapest airfare from Traverse City, Michigan to Quito, was $1,720. Out or curiosity, I checked Miami to Quito, and it was only $404. Airfare from Traverse City to Miami was $300. Book two separate flights and save more than $2,000! The discount sites aren ’ t set up to search in this way yet, so you have to do this on your own. By the way, the whole six-week trip, which we took in 2004, cost $2,400, including losing $100, and being robbed of $174. How much money have I been robbed of?A.
100
B.
2400
C.
2200
D.
174
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【单选题】检查维生素C中的重金属时,若取样量为1.0g,要求含重金属不得过百万分之十,问应吸取标准铅溶液( )多少ml?
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