它们多少钱?
A:How many bananas do you have?
B:How many grapes do you have?
C:How much are they?
如图,在菱形ABCD中,AB = 5,∠BCD = 120°,则对角线AC等于( )
人在生病发高烧时,常常没有食欲,原因是( )
你认为下列的实验方案中可行的是()