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Model：
A：What’s this? A：What are these?
B：It’s a cap． B：They are caps．
A：How much is it? A：How much aye they?
B：It’s 3 yuan． B：They are 8 yuan．
1．A：What’s this? 2．A：________ ________ these?
B：It’s a ________． B：________ ________ ________．
A：_________ _______ ________ ________? A：How ________ ________ they?
B：It’s ________ yuan． B：They are ________ ________ ．
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
