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Mom: I’m afraid you can’t.
Colin: Why? Computer are useful. My friends use them to study and send e-mails.
Mom: But they also use computers to play games. It takes too much time and it’s bad for their eyes.
Colin: I won’t use it to play games. I’ll only use it to study.
Mom: OK, I’ll buy you one.
1．Colin wants a mobile phone.
2．Colin wants to use the computer to study.
3．Colin’s friends play games on computers.
4．Colin will play games on the computer.
5．Computers are not useful.
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
