《2025年快乐过暑假江苏凤凰科学技术出版社五年级提优版》

4. 跨学科 《吕览审时》《吕览审时》说:“圆乃丰满也。”中国人民对圆有着美好的向往,因此也研发出了很多与圆有关的玩具。有一种玩具有大、小两个圆,小圆的半径是 2 厘米,大圆的半径是 5 厘米。小圆沿着大圆内壁滚动直至回到起始位置,小圆扫过的面积是多少平方厘米?

答案： $5-2×2=1$(厘米)
$3.14×(5^{2}-1^{2})=75.36$(平方厘米)

( )1. There are ____ different names for the Chinese years.
A. 3
B. 12
C. 20
B( )2. What's Chinese New Year's Eve?
A. It's the evening of the Spring Festival.
B. It's the evening before the Spring Festival.
C. It's the evening after the Spring Festival.
A( )3. People often ____ before the Spring Festival.
A. make moon cakes
B. play games
C. go shopping and clean the houses
C( )4. Chinese people usually eat ____ on New Year's Eve.
A. jiaozi
B. cakes
C. noodles
A( )5. At the Spring Festival, people usually____.
A. wear new clothes
B. visit their relatives and friends
C. both A and B
C

答案： 1. B 2. A 3. C 4. A 5. C