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Lily was my new friend six years ago. She was years old. She was short and thin. She had short black hair. She was a quiet girl. She didn't like maths classes at all. Now she is in Class 2, Grade 6. She is tall and thin. She has long black hair, She is active. She is good at maths. She often helps me with maths. We help each other and learn from each other.
1．Lily was short and thin six years ago.2．Lily had long black hair before.
3．Lily was an active girl.
4．Now Lily is tall and strong.
5．Now Lily is good at maths.
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
