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Bill and David are good friends. They like sports. They like basketball best. They usually play basketball together on Saturdays. They like ping-pong, too. They sometimes play ping-pong on Sundays. It’s Saturday today. But Bill and David don’t play basketball. They’re in a supermarket now. Bill wants to buy a pair of (一双) blue shoes. He wears size 39 shoes. David wants to buy a pair of red shoes. He wears size 37 shoes.
1．Bill and David like basketball best.2．Bill and David sometimes play ping-pong on Sundays.
3．It’s Sunday today.
4．Bill wants to buy a pair of blue shoes.
5．David’s shoes are bigger than Bill’s.
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
