Mary and Susan are very good friends. They are in the same1 at school and they often visit2homeat weekends. Now they are3eight years old. Mary's mother has got anew baby. Mary is very4to have a little sister. So she isalways talking about her to Susan. At first, she is very5inthe new baby because she doesn't have any brothers or sisters. But6sometime she begins to get tired of Mary's endless talking about(喋喋不休地谈论) it. She also feels alittle jealous(嫉妒) of her friend.
Onemorning when the two girls7on the playground, Mary says to Susan,"Do you8, Sue, my baby sister has put on nearlyhalf a pound in weight(体重增加了半磅) this week."
"That is not very9."answers Susan. "I know a baby and he put on ten pounds a day."
"Oh, that can't be10."answers Mary laughingly. "Whose baby is it?"
"An elephant's." says Susan.