如图，生活在北极的极地狐和生活在非洲沙漠的大耳狐，耳朵大小的不同主要与哪种非生物因素有关？
A．水分
B．温度
C．空气
D．阳光
B
一阵西南风吹来，使得湖面上一木板以每分钟60cm的速度向前推进，则10min后，木板沿______方向下移了______ cm．
Not having work out the problem, leave the office．
A．so he was not allowed to
B．and he didn’t want to
C．the teacher couldn’t make him
D．he couldn’t free himself to
