1946年3月，丘吉尔在密苏里州富尔顿学院演讲中说：“从波罗的海的什切青到亚德里亚海的里亚斯特，一幅横贯欧洲大陆的铁幕已经降落下来。”这里说的“铁幕”指的是

下面四个数中比－2小的数是（    ）

Recent years have________the rapid development of the Internet and its influence on society and people.

根据短文内容，选择正确答案。
Hello, friends!
    My name is Zhou Dan. I'm a Chinese girl. I'm twelve. I'm from Zhengzhou, China. Do you know Zhengzhou? It's in the middle of China. I'm in No. 8 Middle School. There are about 900 students and 50 teachers in our school. It is a good school in Zhengzhou: I'm in Class 2 Grade 7. There are 49 students in our class: 29 girls and 20 boys. My English teacher is Miss Zhao Dan. Our names are almost the same, right? She is nice to me. We're good friends. I like English, and I like music, too. I want to find a pen-friend. Please write to me.
                                                              Yours,
                                                            Zhou Dan

中俄《尼布楚条约》解决的主要问题是(  )