题目内容

下列论断正确的是().

A. 将n(>2)阶行列式的每个元素都乘以2,所得行列式的值为原行列式值的2倍;
B. 若线性方程组的系数行列式的值为零,则方程组只有零解;
C. 若上三角行列式的值为零,则行列式主对角线上至少有一个元素为零;
D. 若上三角行列式对角线上方的所有元素均为零,则此行列式的值为零.

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若一个n(>1)阶行列式中的元素为+1或-1,则其值必为().

A. -1
B. 1
C. 奇数
D. 偶数

One of British tradition is celebrated in countries with British heritage, that is ___________.

A. Boxing Day
Bonfire Night
C. Easter
D. Queen’s Birthday

Bonfire Night is also called __________.

A. Easter
B. Guy Fawkes Night
C. Boxing Day
D. St Patrick’s Day

Christians go to church to commemorate Jesus’ _________ on Easter Day.

A. birth
B. death
C. resurrection
D. sin

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