月季扦插一年四季均可进行,温度需保持在()℃。
A.15
B.20
C.25~28
D.30
参考答案:C
a、b的和是180,a是45,b是a的______倍,a是b的______.
What color ________ the socks? [ ]
A. can
B. do
C. are
D. is