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( ) 1. I brush my teeth before breakfast.
A.
B. 
C. 
( ) 2. I cannot catch the ball. I think it's heavy.
A.
B. 
C. 
( ) 3. My friend and I flew kites in the park.
A.
B. 
C. 
( ) 4. We will go on a trip to the mountain next week.
A.
B. 
C. 
( ) 5. Summer is coming. I need a fan.
A.
B. 
C. 
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
