阅读短文，回答问题。

Bear Amy,

   I want to be your friend. Let me introduce my family to you. My father is a doctor. He is tall and strong. My mother is a teacher. She is think and kind. My brother Sam is 6 years old. He's short and funny. We live in a big city. However, we usually go hiking on the weekends. I have a small and nice room. There is a bed and a desk in my room. I like reading books. I have many books on my desk. Welcome to my home.

                                                                                                                                                                        Yours,

                                                                                                                                                                          Lucy

⑴____ A.Bund     B.found      C.Summer Palace      D.Great Wall

⑵____ A.visited    B.beside      C.saw               D.caught

⑶____ A.why      B.where      C.who               D.did

⑷____ A.our       B.we        C.they               D.he

⑸____ A.cloud      B.windy     C.rainy               D.sunny

“恒盛”超市购进一批大米，大米的标准包装为每袋30kg，售货员任选6袋进行了称重检验，超过标准重量的记作“+”， 不足标准重量的记作“-”，他记录的结果是+0.5，-0.5，0，-0.5，-0.5，+1，那么这6袋大米重量的平均数和极差分别是（  ）