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Sarah has four sisters. They are Betty, Mary, Rose and Ann. Sarah is the oldest of the five. Betty is thirteen years old. She is two years younger than Sarah and one year older than Mary, Rose is nine and Ann is seven.
Sarah and Betty study in a middle school. Mary, Rose and Ann study in a primary school.
从A、B、C、D选出一个正确答案。
1．How old is Sarah? ( )
| A．Nine. | B．Twelve. | C．Thirteen. | D．Fifteen. |
| A．Two. | B．Three. | C．Five. | D．Six. |
| A．Betty. | B．Rose. | C．Ann. | D．Mary. |
| A．Mary. | B．Rose. | C．Ann. | D．Betty. |
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
