—It's so cold today.
—Yes, it's _____________ colder than it was yesterday.
A:some
B:more
C:very
D:much
若函数y=(3-m)xm2-8是正比例函数,则常数m的值是( )
下列实例中属于竞争的是( )
在矩形ABCD中,AD=5,AB=3,AE平分∠BAD交BC边于点E,则线段BE,EC的长度分别为( )