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Amy: Hi! Tom. I have a new classroom.
Tom: Really? Let’s go and have a look. Wow! It’s big and nice.
Amy: Look! A new blackboard, four fans and six lights.
Tom: There is a new computer on the teacher’s desk. How many students are there in your class?
Amy: Twenty.
( ) 1. Amy has a new canteen.
( ) 2. The classroom is small and nice.
( ) 3. There are four fans in the classroom.
( ) 4. There is a new computer on Amy’s desk.
( ) 5. There are twenty students in the class.
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
