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It is three o’clock in the afternoon. Ms Li and some of her students are in the music room. They aren’t having a music lesson. They are cleaning it because (因为) they will hold a birthday party for Mary here. Look! Ms Li is cleaning the board. Betty is sweeping (打扫) the floor. What is Sam doing? He is cleaning the windows with Amy. David is very tall. So he is cleaning the door. Everybody is busy but happy.
1．It is ______ now. ( )| A．three o’clock in the afternoon | B．four o’clock in the afternoon |
| C．three o’clock in the morning | |
| A．sweeping the floor | B．cleaning the windows | C．cleaning the music room |
| A．reading a book | B．cleaning the board | C．sweeping the floor |
| A．cleaning the windows | B．sweeping the floor | C．cleaning the door |
| A．a birthday party | B．an exam | C．a music class |
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
