The world is full of wonders, and some of them we don t discover until we're all grown up.
A.The world is full of wonderful things, and we can only find them out when we become adults. B.The world is full of mysterious things ,and we can not understand them when we are young. C.The world is full of wonderful things, and even adults can only find out some of them. D.The world is full of mysterious things, and children can not understand them at all.正确答案C
