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A. He was young then. B. Is this your father in the picture?
C. What does he do now? D. What did he do before? E. What was he doing?
A: Hello, Jerry.
B: Hi, Tom.
A: 1.
B: No, he is my grandpa. 2.
A: 3.
B: He was a shop assistant ten years ago.
A: What did he sell (销售)?
B: Clothes.
A: 4.
B: He was making a promotion (做促销) in a clothes shop.
A: That’s cool. 5.
B: He doesn’t work now.
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
