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Peter, Jim and Mary are in the same school. Mary and Jim are in Class Two, Grade Five. Peter is in Class Four, Grade Two. Their school isn’t big, but it’s clean. Today is Saturday. They have no lesson. They’re in the shop. Peter wants a red pair of shoes. Jim and Mary want blue pairs of shoes. The red shoes are cheap. The blue shoes are dear. But they are all nice.
1．Peter, Jim and Mary are classmates.2．Their school is small but it’s clean.
3．They are in the school on Saturday.
4．Peter wants the cheap pair of shoes.
5．The blue shoes are nice and cheap.
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
