《2025年快乐过暑假江苏凤凰科学技术出版社七年级提优版》

5. 如图,点C是线段AB上的一点,点M是线段AC的中点,点N是线段BC的中点.
(1)如果AB= 12 cm,AM= 5 cm,求BC的长；
(2)如果MN= 8 cm,求AB的长.
(1) ∵ 点 M 是线段 AC 的中点，∴ $ AC = 2AM $．
∵ $ AM = 5 \text{ cm} $，∴ $ AC = 10 \text{ cm} $．
∵ $ AB = 12 \text{ cm} $，∴ $ BC = AB - AC = $2$ \text{ cm} $．
(2) ∵ 点 M 是线段 AC 的中点，点 N 是线段 BC 的中点，∴ $ BC = 2NC $，$ AC = 2MC $．
∵ $ MN = NC + MC = 8 \text{ cm} $，
∴ $ AB = BC + AC = 2MN = 2 × 8 = $16$ (\text{cm}) $．

答案： 5.
(1)
∵ 点 M 是线段 AC 的中点，
∴ $ AC = 2AM $．
∵ $ AM = 5 \text{ cm} $，
∴ $ AC = 10 \text{ cm} $．
∵ $ AB = 12 \text{ cm} $，
∴ $ BC = AB - AC = 2 \text{ cm} $．
(2)
∵ 点 M 是线段 AC 的中点，点 N 是线段 BC 的中点，
∴ $ BC = 2NC $，$ AC = 2MC $．
∵ $ MN = NC + MC = 8 \text{ cm} $，
∴ $ AB = BC + AC = 2MN = 2 × 8 = 16(\text{cm}) $．

Hello! My name is Bill. I'm an English boy. Now I'm in China with my sister Sally, my parents Jack and Kate.
In China, there is a special day about shopping. On that day, many people buy a lot of things online(在线的).
This year, my mother buys some things for us. They are a quilt, four jackets, two cups and a pen. The quilt is blue. It's for me. The red jacket is for my mother. The two yellow jackets are for Sally and me. The black jacket is for my father. The white cup is for Sally and the other cup is for my mother. It's green. The black pen is for Sally.
My mother likes shopping online. She says it's convenient(方便的). She doesn't need to go out and the couriers(快递员) deliver things home.
1. Who is Bill's mother?
His mother is Kate. /Kate.
2. What does Bill's mother buy for herself?
A red jacket and a green cup.
3. Why does Bill's mother say shopping online is convenient?
Because she doesn't need to go out and the couriers deliver things home.

答案： 1. His mother is Kate. /Kate.
2. A red jacket and a green cup.
3. Because she doesn't need to go out and the couriers deliver things home.

Nowadays, 1a lot of young people are turning to the past for their clothes choices. They start to 2 (put) on traditional clothes, hanfu.
As the government encourages the renaissance(复兴) of traditional culture, hanfu is getting more and more 3 (popular) with the teenagers. Every year, we can watch different hanfu 4 (shows) around the cities. These shows bring 5 (us) back to the Han Dynasty. We 6 (learn) more about the history, traditional culture and beauty from them.
Hanfu hasn't been in the same style since the Han Dynasty. 7However, this kind of clothes has something in common. They all have large soft robes(袍子), with sleeves(衣袖) that hang down to the knees, so the hands can't be seen. In modern China, there are many hanfu lovers 8who are from history fans, cartoon fans to clothes fans.
"Clothes are the basic part of culture, so both the traditional clothes and modern clothes 9 (play) the same role in culture," said Zhang Jun, a famous reporter, "If the people and the country do not even understand our traditional clothes or don't wear them, how can we talk 10about other important parts of our culture?"
1. ______ 2. ______ 3. ______ 4. ______ 5. ______
6. ______ 7. ______ 8. ______ 9. ______ 10. ______

答案： 1. a
2. put
3. popular
4. shows
5. us
6. learn
7. However
8. who
9. play
10. about