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Hello, I'm Li Ping. I'm a student. I'm in Class 2, Grade 6. There is a new library in my school. There are many books in it. But there wasn't a library three years ago. My classroom is big and clean. There is a computer on the teacher's desk. There is a map of China on the wall. But there wasn't a computer or a map in my classroom two years ago. Five years ago there were one thousand students in my school. But now there are two thousand students. My school is beautiful. I love it.
1．Li Ping is a student.2．There isn't a library in Li Ping's school.
3．There was a computer in Li Ping's classroom five years ago.
4．There is a map on the wall now.
5．There were 1000 students in Li Ping's school five years ago.
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
