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Mum: Billy, is your schoolbag ready?
Billy: Yes, Mum.
Mum: What’s in your schoolbag?
Billy: Let me see. A cap, a cup, two
, three toys and a pencil box. Mum: Is your
in your schoolbag?Bily: No, it isn’t. But where is it?
Mum: Is it in the
?Billy: Yes, it is. It’s near the
. Thanks, Mum. Mum: Would you like some
? You can eat them on the bus(公共汽车). Billy: Yes, please.
Mum: OK. Here you 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
