根据经验,非生产用砖混结构二等房的耐用年限是( )年。
A.30
B.40
C.50
D.60
参考答案:C
解析:非生产用砖混结构二等房的耐用年限为50年。
The shirt I bought last week has________so much after washed that I can't wear it any more. [ ]
A. shrunk
B. contracted
C. torn
D. swollen
一个母细胞经过减数分裂可以形成子细胞的个数为()。
A.1
B.2
C.3
D.4