We have twenty minutes' rest between classes. Look! Most of us are playing during the break time. Some students are on the playground. They are playing basketball. Oh! A boy is running with the ball. And another is trying to stop(阻止) him. They look so cool. And there are some girls watching the game. Some students are in the classroom. They are talking. A few of them are reading and doing homework. Look!  A girl is looking at the birds in the tree in front of the classroom. She must be thinking of something interesting because she is smiling. What are the teachers doing? Some of them are working in the office. And some are talking with students. Everyone is doing his or her things. They are busy but happy.

下列生活现象中发生化学变化的是(      )

    More than 95 percent of people in the world have phones today, according to the United Nations. People use phones to make phone calls and send ____ (信息)to communicate with others. Now we hardly write letters. But a TV show, Letters Alive, is bringing back this old ____(习惯).

    Letters Alive gets its idea from a UK program with a ____ (相似的) name. They have something in common. The shows both ____ (邀请) famous actors and actresses, but there are no funny jokes or different competitions.____ (代替), it is just one person reading a letter. Since it has been on in____ (十二月) , Letters Alive has been widely praised.

    The letters were written by people from different times in history. For example, once they read a letter written by famous writer Xiao Hong to her brother who is ____ (年轻的) than her in 1941. The letter shows that Xiao Hong____ (想念) her brother so much and had great hopes for his future.

    “Every letter opens another world for us,” said Guan Zhengwen, the ____ (导演) of the TV show. “It seems that we can experience the real lives and feelings of the writers.”

____ (不管怎么说)，many people said that it has provided a breath of fresh air to today's TV shows.