In some cities, the junior pupils look forward to having ______ time to relax and ______ homework to do.
A:less; more
B:more; less
C:fewer; more
D:much; many
焊接金属时,能用作保护气的一组气体是( )
如(x+m)与(x+3)的乘积中不含x的一次项,则m的值为( )