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Daming: What are you doing, Simon?
Simon:
Daming: Have you got any stamps from China?
Simon: No, I haven’t. You always send me emails.
Daming: I will send you lots of Chinese stamps later.
Simon: Thank you.
Daming: No, I don’t.
Simon: Here are some postcards from the US and Canada for you.
Daming: Thank you.
| A．You don’t send me letters. |
| B．Do you collect stamps? |
| C．You can make a postcard book with them. |
| D．I’m putting my new stamps into my stamp book. |
| E．But I like collecting postcards. |
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
