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（______）1．Good-bye!
（______）2．What's this?
（______）3．How are you?
（______）4．See you later!
（______）5．How many pencil boxes do you have?
A．I'm fine, thanks.
B．See you!
C．I have six pencil boxes.
D．Bye-bye!
E．It's a pencil box.
A．I'm fine, thanks.
B．See you!
C．I have six pencil boxes.
D．Bye-bye!
E．It's a pencil box.
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
