45.Which of the following can best fit into the blank in the paragraph below?
(A)jumping，running，swimming，and other exercises are also important
(B)nutrition，sleep, rest，and good health habits are also important
(C)eating, sleep，reading，and doing homework are also important
(D)watching television，chatting, staying up late，and having fun are also importantIt is true that physical fitness depends greatly on exercise，but_____ . Physicaleducation programs in schools，therefore，emphasize the learning of good health habits as well as provide opportunities for physical activities.