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1．Yes, it is. ( )
| A．Are they your parents? | B．Is this your grandpa? |
| C．Did he learn English? | |
| A．How is she doing? | B．What did she do? |
| C．Why was she wearing those clothes? | |
| A．What was Mr Li doing? | B．What is Mr Li doing? |
| C．What does Mr Li do? | |
| A．Who is Chen Hai? | B．What does Chen Hai do? |
| C．What is Chen Hai doing? | |
| A．What did he do? | B．Did he go to school? |
| C．Where did he go? | |
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
