坐在行驶的船中的乘客,我们说他静止,选择的参照物是( )
A:河水
B:船舱
C:河岸上的树
D:迎面驶来的船
—It's getting late. I really _____go now, my daughter is home alone.
Don't sit ______ the middle ______ the classroom. You are too tall.
x−23=12 ,x=____ 45+x=1 ,x=____
x÷0.5=2,x=____
7x=14.7,x=____