(
A. He is watching TV. B. He is washing the dishes. C. He is making the bed.
(
A. Because he is making the bed. B. Because he is not at home.
C. Because he is doing his homework.
(
A. She is in her bedroom. B. She is in the living room. C. She is in the classroom.
(
A. She is having a lesson. B. She is dancing. C. She is making the bed.
(
A. Because she can't wash the dishes. B. Because she is sleeping.
C. Because she will have a dancing lesson at 9 o'clock.
(
A. Mum. B. Tim. C. Nobody.
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