I ____________many books.[ ] A. am B. ha

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问题选择题

I ____________ many books.[ ]

A. am

B. have

C. fun

答案

答案：B

选择题

On the man’s face , there was a smile that seemed to suggest that he _______ in suggesting that the meeting ______ off .

A．should succeed , was put

B．succeeded , put

C．should succeed, be put

D．succeeded , be put

不定项选择题

下列对水垢的主要成分是CaCO₃和Mg(OH)₂而不是CaCO₃和MgCO₃的原因解释中正确的有 [ ]

A．Mg(OH)₂的溶度积大于MgCO₃的溶度积，且在水中发生了沉淀转化

B．Mg(OH)₂的溶度积小于MgCO₃的溶度积，且在水中发生了沉淀转化

C．MgCO₃电离出的CO₃^2-发生水解，使水中浓度减小，对Mg(OH)₂的沉淀溶解平衡而言，Qc<Ksp，生成Mg(OH)₂沉淀

D．MgCO₃电离出的CO₃^2-发生水解，使水中OH^-浓度增大，对Mg(OH)₂的沉淀溶解平衡而言，Qc>Ksp，生成Mg(OH)₂沉淀