The problem of ______to select as his successor was quickly disposed of.
A. what
B. whom
C. which
D. how
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设矩阵B的列向量线性无关，且BA=C，则( )
A. 若矩阵C的列向量线性无关，则矩阵A的列向量线性相关
B. 若矩阵C的列向量线性无关，则矩阵A的行向量线性相关
C. 若矩阵A的列向量线性无关，则矩阵C的列向量线性相关
D. 若矩阵C的列向量线性无关，则矩阵A的列向量线性无关
According to the selection, how do sociologists and psychologists differ
A. Sociologists are more concerned with explaining behavior than are psychologists.
B. Psychologists focus more on individuals than do sociologists.
C. Sociologists spend more time helping people solve their problems than do psychologists.
D. Psychologists are more interested in understanding patterns of human relationships than are sociologists.
He's______ as a" bellyacher" -- he' s always complaining about something.
A. who is known
B. whom is known
C. what is known
D. which is known
下列关于合同纠纷适用诉讼时效的说法中，正确的是（ ）。
A. 行政合同争议，诉讼时效为1年
B. 请求撤销合同，诉讼时效为1年
C. 国际货物买卖合同争议，诉讼时效为4年
D. 承租人不交租金产生的争议，诉讼时效为2年
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