________ that the trade between the two countries reached its highest point. A) During the 1960’s B) It was in the 1960’s C) That it was in the 1960’s D) It was the 1960’s（B）

The story happened ______. A: in 1960's B: in his 60's C: in 60's D: in the 1960's

取字符串s的倒数第i个字符，正确的表达式是（ ）。 A: Mid(s,i,1) B: Mid(s,Len(s)-i,1) C: Mid(s,Len(s)-i-1,1) D: Mid(s,Len(s)-i+1,1)

设S="中华人民共和国",表达式Left(S,1)+Right(S,1)+Mid(S,3,2)的值为()

The Mid­Autumn Festival dating back in China’s Tang Dynasty．

已知三阶矩阵$A$满足$\mid A-E\mid=\mid A-2E\mid=\mid A-3E\mid=0$，则$\mid A\mid$=( )。 A: $4$ B: $6$ C: $12$ D: $3$

The acronym “MICE” came into being in the mid 1990s, it's fully recognized that the term MICE relates to meetings,______ ,______ ,______ .

设$A,B$是$n$阶正交矩阵，且$\mid A\mid=-\mid B\mid$，则( ). A: $A+B$可逆 B: $A+B$不可逆 C: $\mid A+B\mid=1$ D: $\mid A+B\mid=-1$

用于获得字符串S从第3个字符开始的两个字符的函数是（ ）。 A: Mid(S，3，2) B: Middle(S，3，2) C: Left(S，3，2) D: Right(S，3，2)

在字符串S中，从第二个字符开始获得4个字符的子字符串函数是( )。 A: Mid(S,2,4) B: Left(S,2,4) C: Right$(S,4) D: Left$(S,4)