题目内容

Education made __________ possible for the younger generation to realize their dreams.

A. this
B. that
C. it
D. what

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When he returned home three days later, he found the TV set in the sitting room ________.

A. lost
B. disappearing
C. going
D. missing

The organization __________ food and blankets to the earthquake victims.

A. grabbed
B. gained
C. distributed
D. reacted

The manager did a poor job in the company and was _________ by someone else.

A. renewed
B. resumed
C. refused
D. replaced

n阶矩阵A与对角矩阵相似的充要条件是（）

A有n个不同的特征值
B. A有n个非零的特征值
C. A有n个线性无关的特征向量
D. A有n个不同的特征向量