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I have three classmates. They're Ben, Amy and Andy. Ben is an American boy. He is thirteen. He has two big brown eyes and a small nose. His hair is brown too. He likes bananas and pandas. Amy and Andy are English. Amy is twelve. She has long hair and a big mouth. She's tall. She likes monkeys. Andy is twelve too. His hair is black and short. His ears and mouth are big. But his eyes are small. They all can skate well. They are my good friends.
1．Ben and Andy are twelve years old.2．Amy and Ben are English.
3．Andy's and Amy's mouths are big.
4．Ben has black hair and Andy has brown hair.
5．Ben, Amy, Andy and I are classmates and friends.
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
