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【单选题】
将过量的 CO 2 通入稀 NaOH 溶液中 , 待完全反应后形成缓冲溶液体系 , 则其缓冲溶液对为 ( )A.
Na 2 CO 3 -H 2 CO 3
B.
NaHCO 3 - H 2 CO 3
C.
Na 2 CO 3 - NaHCO 3
D.
NaOH- H 2 CO 3
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反馈参考答案：
举一反三
【判断题】The standard form. of British English can be can be represented by the BBC broadcast. ()
A.
正确
B.
错误
【单选题】Standard English is based on the speech of the upper class of ________England, adopted as a broadcasting standard in the British media.
A.
central
B.
northeastern
C.
southeastern
D.
northwestern
【单选题】The young man was by his grandma in London，so he can speak standard British English．
A.
brought up
B.
caught up
C.
made up
D.
showed up
【简答题】A. American B. British C. standard D. enough
【单选题】Standard English is based on the speech of the upper class of ______, adopted as a broadcasting in British media.
A.
northeastern England
B.
southeastern England
C.
northeastern Scotland
D.
southeastern Scotland
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