下列关于向量组的极大线性无关组的说法中，错误的是（ ）．
A. 一向量组的极大线性无关组与向量组本身等价
B. 一向量组的极大线性无关组一定是不唯一的
C. 一向量组的任意两个极大线性无关组等价
D. 一向量组的任意两个极大线性无关组含有相同个数的向量
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According to the passage, what is a gap year?
A. It is the one-year-long break after high school.
B. It is the one-year-long break before or after high school.
C. It is the one-year-long break after university.
D. It is the one-year-long break before or after university.
According to the passage, why do students take a gap year?
A. To have a good rest.
B. To travel to different countries.
C. To get more experiences and prepare for future career.
D. To explore interests and develop a purpose for the future.
Which of the following is NOT mentioned as the help students can get from the organizations?
A. Finding a host family.
B. Setting up the volunteer project.
C. Taking care of meals.
D. Choosing a major in university.
对账简单说就是核对账目，是指为了保证各种账簿记录的正确、完整，如实（）的状况。
A. 核算和监督管理活动
B. 核算和监督经济活动
C. 反映和核算管理活动
D. 反映和核算经济活动
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