—________ your sister often ________ sports?
—Yes,she often ________ tennis with my parents.
A:Does, do;plays
B:Do, does;plays
C:Does, do;play
已知三个数,x,y,z,满足 xyx+y=−3,yzy+z=34,zxz+x=−34 ,则 xyzxy+yz+zx 的值为____
下列各组函数中表示同一函数的是 ( )
关于台湾的描述正确的是( )
过氧化氢(H2 O2)为淡蓝色粘稠液体,是中学常见试剂