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例：—How many pencils do you need?
—I need four pencils.
—How much are they? two dollars for one
—They are eight dollars.
1. —How many ________do you need?
—I need ________ ________.
—How much ________ ________?
—________ ________ ________fifty dollars for one
________ ________ ________ ________.
2. —How many ________do you need?
—I need ________ ________.
—How much ________ ________?
—________ ________ ________ ________.three dollars for one
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
