阅读短文，选择正确答案。 Mary is a little girl. She is only five, she does not go to school, and, of course, she doesn't know how to read and write. But her sister, Kate, is a school girl. She's ten. One day, Kate sees her little sister at the table and there is a pen in her hand and a piece of paper in front of her. ' What are you doing, Mary? ' she asks. ' I'm writing a letter to my friend Kitty.' Says Mary. ' But how can you? ' says her sister. ' You don't know how to write.' ' Well.' says Mary. ' It doesn't matter, because Kitty does not know how to read, either.' 1. Does Mary know how to read and write?  _____________. [     ] A. Yes B. No C. She knows a little D. Not sure 2. Mary's sister _____________. [     ] A. is fire B. is younger than Mary C. is not a student D. is ten years old 3. One day, Mary _____________. [     ] A. is drawing a picture B. is doing her homework C. is sitting on the table D. is writing a letter 4. Mary's friend, Kitty is _____________. [     ] A. ten year's old B. five C. a student D. Not a student 5. You think Mary is _____________. [     ] A. warm-hearted B. ten-year-old C. very interesting D. stupid