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Welcome to my classroom（教室）. There is a big desk for my teacher. Can you see blackboards? Yes, there are two blackboards in my classroom. There are twenty desks for the students. How many students are there in my class? Are there twenty? No, there are forty. Two students have one desk. There are four windows. At the window, there are twelve flowers. I like my classroom.
1．“Blackboard” means ________. ( )A． | B． |
| A．20 | B．2 | C．10 |
| A．20 | B．40 | C．21 |
| A．There are twenty. |
| B．There are forty. |
| C．There are thirty. |
| A．There are twenty. |
| B．There are forty. |
| C．There are twelve. |
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
