单项选择题

Due to large investment in housing, many cities can ________ the flow of new arrivals, improving the quality of their life.

A. give rise to
B. make way for
C. take part in
D. keep pace with
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He believes his project (项目) is _______ in Northern Ireland.
单项选择题
调节0.1mol／l磷酸盐溶液(pKa1=2.6,pKa2=7.21,pKa3=12.32)的pH=8.0时，溶液中各种存在型体平衡浓度间关系是()。
A、[PO43-]>[HPO42-]
B、[H2PO4-]>[HPO42-]
C、[HPO42-]>[H2PO-]
D、[H3PO4]>]H2PO4-]
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