A.how the genes work in your body

　　B.how your parents’ height influence you

　　C.how you look like your parents

　　D.how you grow to a certain height

　　44.After reading this passage, we can explain ______.

　　A.how good it is to be a doctor

　　B.how much sleep time we need

　　C.why genes can’t decide everything

　　D.what healthy diet is

　　45.Which is NOT mentioned in the passage?

　　A.Your height most probably depends on how tall your parents are.

　　B.Girls’ age for starting puberty is usually earlier than that for boys’.

　　C.The features showing the first changes of puberty between boys and girls are different.

　　D.You may be amazed sometimes when you grow too fast.