蝙蝠通常在夜间出来活动、觅食，但它们从来不会撞击到墙壁、树枝上，并且能以很高的精确度确认目标．这主要是因为（ ）

阅读理解

    Mary is a very little girl. She is only three years old. She can't read and write, but she likes drawing very much.

    One day, her sister, Jean sees her at the desk. She thinks Mary is drawing. She comes to her, but she finds Mary isn’t drawing. She is writing on the paper.

“What are you doing, Mary?” Jean asks her.

“I’m writing to Ann. ” She answers.

“But you don’t know how to write, how can you write to her?”

“Oh, it doesn’t matter(没关系). Ann can’t read and write, either(也). ”

诗歌赏析
                                                                                                                            《相见欢》李煜
                                                                                               无言独上西楼，月如钩。寂寞梧桐深院锁清秋。
                                                                                               剪不断，理还乱，是离愁。别是一般滋味在心头。