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【单选题】
已知某二元弱酸H2A的pKa1=6.37,pKa2=10.25,NaHA与Na2A组成的缓冲体系的缓冲范围为:
A.
6.37～10.25
B.
9.25～11.25
C.
5.37～7.37
D.
7.37～11.25
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【单选题】听力原文：M: Has John come back from Europe? W: Yes, but he was only in America for three days before his company sent him to Canada. Where is John now?
A.
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B.
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