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29.______________we are living in the big data era, we are able to collect and analyze as much patient informationas possible.

A)Even though
B)As if
C)In that
D)Now that

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30. It has been quite some time since we _________you at your office in Beijing.

A)visit
B)visited
C)have visited
D) had visited

Section BDirections: There are 5 incomplete statements here. You should fill in each blank with the proper form ofthe word given in brackets. Write the word or words in the corresponding space on the AnswerSheet.31. What we're trying to do is to have companies (manage)_______and use plastic much more wisely.

生物碱的沉淀反应条件是( )

A. 酸性有机溶剂
B. 酸性水溶液
C. 碱性水溶液
D. 碱性有机溶液

生物碱的碱性表示方法多用( )

A. kb
B. pkb
C. ka
D. pka
E. PH