Takeit______.Itisnothingbutajoke.
A、easy
B、easily
C、serious
D、seriously
Hethoroughlyunderstoodthesociety__________.
A、Hethoroughlyunderstoodthesociety__________
B、whichhadhegrownup
C、inwhichhehadgrownup
D、hehadgrownupinit
求函数f(x,y)=x^2+y^2在条件2x+3y=1下的极值.
A、资本主义体系
B、社会主义体系
C、民主主义体系
D、共产主义体系
________fromtheoccasionallatenightparty,ourneighborsareveryquiet.
A、Apart
B、But
C、Except
D、As