若x2+mx-15=(x+3)(x+n),则m的值为( )
A:-5
B:5
C:-2
D:2
The Greens ________live in the south of Asia . They don't want to move to the north because they ________ the cold weather.
下列实验设计正确的是( )
下面关于人体生命活动调节的叙述,正确的是( )。