当(m+n)2+2004取最小值时,m2﹣n2+2|m|﹣2|n|=( )
A:0
B:-1
C:0或﹣1
D:以上答案都不对
若要让一株桃树上的枝条既开红花,又开白花,园艺师可采用的方法是( )
I got on the bus and found a seat near the back, and then I noticed a man ____ (sit) at the front.