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| ten years ago | now | |
| Tom’s grandpa | driver | worker |
| Tom’s mother | dancer | teacher |
| Lingling | a little girl | pupil |
| Amy | student | teacher |
| Sam | a little boy | pupil |
| Daming | student | doctor |
例:Ten years ago, Tom’s grandpa was a driver.
Now he’s a worker.
1. Ten years ago, Tom’s mother
Now
2. Ten years ago,
Now
3. Ten years ago,
Now
4. Ten years ago,
Now
5. Ten years ago,
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
