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A: Hi, Li Ming!
B: Hi, Wang Dong!
A: I hear that we are going to have a class meeting. 1．?
B: Tomorrow. Our teacher asked me to host (主持) the class meeting.
A: I think you can do it. 2．?
B: It’s about safety. We know safety is important to every student.
A: 3．?
B: We are going to watch a video about safety first, then have a discussion.
A: Why not ask a policeman to teach us how to avoid accidents?
B: 4．.It may help a lot. Thank you.
A: 5．.
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
