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( )1.爸爸叫你不要打开门，他会对你说：
A. Open the door. B. Don’t open the door.
( )2.好朋友请我帮助他开门，他应该说:
A. Open the door, please. B. Close the door, please. C. Thank you.
( )3.当踢完足球满头大汗进教室时，我请我同桌:
A. Close the window. B. Open the window.
( )4.同学David帮助我关门后，我对他说：
A. Close the door. B. Thank you. C. Yes, David
( )5.上课了，值日班长说：
A. Stand up. B. Sit down.
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
