The writer became well-known in A: his thirties in the 1980s B: the thirties in his 1980 C: his 30s in 1980s D: the thirties during the 1980

How do we read “在17世纪30年代”in English? A: in the thirties of the sixteenth century B: in the thirties of the seventeenth century C: in the seventeen thirties

He began to write poems in ______ . A: the thirtieth B: the thirties C: his thirty's D: his thirties

She's in her mid-thirties—thirty-six to be _____. A: active B: actual C: radioactive D: exact

Only when I reached thirties,________________

26. The hero of the story is an artist in his _____, who lived in _____. A: thirty; the 1930s B: thirties; the 1930 C: thirty; 1930s D: thirties; the 1930s

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: $3$

He became quite a notable (direct) _____ in the thirties and forties.

According to the author, people over thirties are considered to be old

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: $\mid A+B\mid=-1$