Are you able to send a letter with pictures and sounds to someone somewhere in the world without a stamp(邮票) on it? Using a computer you can send e-mails quickly and easily. The post is much slower than e-mail. E-mail can send its message to the other side of the world in seconds.

    E-mail is easy to use and it saves time and money. The differences in time in different parts of the world do not matter when sending e-mail. It's twenty-four-hour service(服务) that you can send e-mail at any time of the day or night. No one has to be there to get e-mail. It does not matter if your friends are in beds when you send e-mail to them, or you are seeing a movie at the movie theater when they send e-mail back.

①激发我们对人生道路和人生理想的思考

②给予我们自我完善的力量

③昭示着做人、做事的基本态度

④引导我们检视自身的不足，走向完美

    In our town, there is a big zoo with a lot of animals in it. There are so beautiful tigers and two old lions. They eat a lot of meat every day.
There are also two big elephants and one baby elephant. The elephants are kind animals. They eat a lot every day. They like children. Children often give them bread and bananas. Elephants like bananas best.
    In our zoo there are also brown bears, black bears and white bears. They stand on their hind legs, hold up their four legs and ask for food. They like cakes very much.
    There's also a children's corner in our zoo. Children ride horses and donkeys and watch the monkeys there. The monkeys are very funny. They climb up ropes and jump down again and play with each other like small children.

A：____?

B：No. It is a photo of my uncle's family.

A：____?

B：They are in London.

A：____?

B：Yes. My cousin's name is Cui Tong.

A：____?

B：Thirteen.

A：____  ?

B：No. he is in Grade 8. But the girl is in Grade 7.

A：Oh. I see. She is his sister

节日前夕，小李在家门前的树上挂了两串彩灯，这两串彩灯的第一次闪亮相互独立，且都在通电后的4秒内任一时刻等可能发生，然后每串彩灯以4秒为间隔闪亮，那么这两串彩灯同时通电后，它们第一次闪亮的时候相差不超过2秒的概率是（   ）