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Look at our classroom. There are many things in it. There are thirty-three students’ desks and a teacher’s desk. There is a blackboard on the front wall. On the teacher’s desk, there are some flowers and picture books. On the back wall, there is a clock. It tell us time. Near the clock, there’s a blackboard too.
1．How many desks are there in the classroom? ( )| A．33. | B．30. | C．34. |
| A．Yes, there is. | B．No, there isn’t. | C．Sorry, I don’t know. |
| A．Flowers. | B．Flowers and pictures. | C．Flowers and books. |
| A．A blackboard. | B．A clock. | C．A blackboard and a clock. |
| A．Yes, there is. | B．No, there isn’t. | C．Sorry, I don’t know. |
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
