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I’m Sarah. Thirty years ago, I was a pupil. My dad was a teacher. He taught Maths. I was in his class. I studied very hard. I was a good pupil. Now, my dad doesn’t work. I am a teacher in a school. I teach English, because I like English. And I am writing a book in English. The children in my class love English very much and study well.
1．Sarah was a pupil thirty years ago.2．Sarah’s dad taught her English.
3．Now Sarah ’s dad works in a school.
4．Sarah wrote a book in English thirty years ago.
5．Sarah is an English teacher now.
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
