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It’s four o’clock in the afternoon. Miss White and her students are all in the classroom.They aren’t having a class. They are cleaning the classroom now. Look, Miss White is cleaning the blackboard .Wu Wei is sweeping the floor. What is Chen Yu doing? Look, she is cleaning the windows with Amy. Zhang Peng is very tall, so he is cleaning the door. Mr Black is helping him.Now the classroom is clean and bright. They are tired ,but they are very happy.
（ ）1. The students are in the computer room now.
（ ）2.Miss White is cleaning the door.
（ ）3.Chen Yu and Amy are cleaning the windows.
（ ）4 Zhang Peng is cleaning the door beacuse he is tall.
( ) 5.The students aren’t tired and happy.
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
