题目

阅读下面问题： ； 。试求： （1）的值；（2）的值； （3）（n为正整数）的值。 答案：（1）=；（2）=； （3）=。Look, think and write. 根据图示补全对话。1.     She is _____  _____ her skipping rope.2.     A: _____ is it?        B: It's a pen.    A: Where is it?        B: It's _____ the eraser.  3.          — How many dogs are there _____ _____ _____ the house(房子)?     — There are _____.  4.              Please put your book _____ your head.5.      — Where is Danny?     — He is _____ the desk.