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| Mason’s Clothes Store | ||
| Clothes | Color | Price |
| Socks | white, blue | $4 |
| Pants | black | $11 |
| Sweater | red, white | $8 |
| T-shirt | red, green, black | $7 |
| Hat | black, red | $6 |
1．Which is the cheapest of all? （ ）
| A．Hat. | B．T-shirt. | C．Pants. | D．Socks. |
| A．$14. | B．$20. | C．$21. | D．$22. |
| A．black pants | B．a blue sweater | C．a green hat | D．red socks |
| A．a sweater | B．a hat | C．a T-shirt | D．none (全无) |
| A．a sweater and a pair of pants | B．two T-shirts and a pair of socks |
| C．two sweaters | D．a sweater and two hats |
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
