室内空气污染物主要为一氧化碳、氮氧化物、悬浮颗粒等。一般来说，其污染程度户外高于室内

下列事件：①打开电视机，它正在播广告；②从一只装有红球的口袋中，任意摸出一个球，恰是白球；③两次抛掷正方体骰子，掷得的数字之和＜13；④抛掷硬币1000次，第1000次正面向上，其中为随机事件的是 ______（填序号，答案格式如：“①②③④”）．

我国最大的岛屿是       岛，面积最大的省级行政单位是                    。

电流互感器工作时，相当于一台（）的变压器。

阅读理解

     If there is one thing that matters in high school－and for your whole life－it is friendships．

My latest novel，THE UNWRITTEN RULE，is about a girl，Sarah，who falls for her best friend

Brianna’s boyfriend，Ryan，but it’s more about wrestling with feelings for a guy that you know you

shouldn’t have．A lot of the book deals with friendship，the kind of lifelong friendship that means the

world to you．．．and what happens when you realize that maybe it isn’t what you think it is．

     Maybe your best friend isn’t your best friend．Maybe she isn’t even a friend at all．

Friendships are tricky things．You can he sure everything is fine，and that your friendship is going

to last forever．．．and it can just end．No explanation，no anything．And it is not easy．In fact，

I think losing a friend is worse than losing a boyfriend，especially when it is a friend you’ve had in

your life for a long time．

     One of the things that Sarah struggles with in THE UNWRITTEN RULE，beyond her feelings

for Ryan，is her friendship with Brianna-how long they’ve been friends，how she understands Brianna

in a way no one else does，and what to do when a crack appears in their friendship，not because

of Sarah’s feelings for Ryan，but because Sarah begins to wonder if maybe Brianna isn’t her best

friend after all．

     Having a friendship end is incredibly painful and one of the things I hated when I was younger-and

that I still hate now-is how people say．“Oh，it’ll be okay．You’ll move on，you’ll be fine．”

     It is true that you will eventually move on and that you will be fine．But you will also always carry

that lost friendship with you．It may not take up all of your heart like it does at first，but it will take

 part of it．

     And that，I think，is something no one ever talks about and that I wish we could - and would．

     What do you do when someone you are friends with decides your friendship is over?    

     How do you deal with it?

     Maybe my latest novel can provide something for you．

1. From the passage we can infer that.

A. it may takes Sarah a long time to recover after she lost Brianna’s friendship

B. Sarah and Brianna are still best friends after a long period of time

C. Sarah does not value Brianna’s friendship at all

D. Ryan would feel puzzled about his real love

2. What do you think the book THE UNWRITTEN RULE is mainly about?

A. Friendship    

B. School life    

C. Love      

D. Wrestling with feelings

3. What’s the writer’s attitude towards friendship?

A. We will all lose some friends in our life．

B. Ending a friendship is worse than losing a boyfriend．

C. It’s usual when a crack appears．

D. You will eventually move on after you lose a friendship．

4. What do you think is the best title for the passage above?

A.My Latest Novel  

B.Tricky Friends

C.Sarah and Brianna

D.Unforgettable Friendship

设有关系R(S,D,M)，其函数依赖集F＝{S→D,D→M}。则关系R至多满足________。

A．1NF

B．2NF

C．3NF

D．BCNF