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Mum: It's cloudy.
Sam: I'm making a birthday card for David.
Mum: Really?
Sam: It's on April 21st.
Mum: Sam,
Sam: OK, Mum. I'll keep my room clean, too.
Mum: Good boy!
Sam: She's writing an email in the study.
Mum: How about your dad?
Sam:
Mum: Shh! Talk quietly! I will come back home this weekend.
Sam: Hooray!
| A．keep your desk clean. |
| B．When is his birthday? |
| C．What are you doing, Sam? |
| D．Dad is so tired! |
| E．What is your sister doing? |
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
