A:where
B:how
C:whe
D:what
甲轮滚动2周的距离乙轮要滚动3周,甲轮与乙轮的直径比是( )
四位同学针对食物链“绿色植物→食草昆虫→食虫鸟”发表了他们的见解,你认为不正确的是( )
There are so many people in the shop. You must _________ your things.