选出最恰当的答案( )
A:The food.
B:Their car.
C:The supermarket.
D:Their house.
→You have ____ ____ ____; I think you'd better lose weight.
能用光的直线传播知识解释的现象是( )
若x>y,则下列式子中错误的是( )
青蛙的发育过程依次要经历的时期是( )