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Salesperson: Can I help you?
Jack: Seven pineapples, please.
Tutu: I want one watermelon. How much is it?
Salesperson: Four dollars.
Lisa: What are these?
Salesperson: They’re oranges. How many do you want?
Lisa: Ten oranges, please. How much are they?
Salesperson: Ten dollars.
Peter: Wow! Nice pears ! I want eight pears. How much are they?
Salesperson: Eight dollars.
1．Jack wants seven pineapples. （_____）
2．One watermelon is five dollars. （_____）
3．Lisa wants ten oranges. They’re ten dollars. （_____）
4．Eight pears are sixteen dollars. （_____）
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
