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Dongdong: Hi, Lisa.
Lisa: Hi, Dongdong.
Dongdong: May I borrow your pen? You have so many pens.
Lisa: Yes, I collect pens. I have fifty.
Dongdong: Really? I collect erasers. I have fifty erasers, too.
Lisa: Can I have a look?
Dongdong: Certainly. Look!
Lisa: Your erasers are nice.
Dongdong: Thank you.
1．What does Dongdong collect?
_______________________
2．How many pens does Lisa have?
_______________________
3．What does Lisa collect?
_______________________
4．How many erasers does Dongdong have?
_______________________
5．Are Dongdong’s erasers nice?
_______________________
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
