How many hours are there in a day?

how many hours are in a day How many hours are there in a day? How many hours are there in 7 days How many hours are there in 7 days?这个英语单词是什么意思 how many minutes in 2 hours how many hours one day?for happy how many bears are How many derks are how many trees are how many books are How many hours do you sleep every night?中的how many hours how much time how long how often How many hours does the store friendly什么意思Are the people in the store friendly?什么意思 how many hours（days..）可不可以等于how long? I don't know__sheep there__on the farmA.how many ,areB.how much ,are请问为什么 How many hours will you stay for?这话有错吗How mang hours will you stay? how many legs are there? how many stop are there How many pears are there?