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Today, we usually go out by e-bike (电动自行车) . It’s very fast and convenient (方便的) . But we should protect (保护) ourselves. We must pay attention to the traffic lights. Some people ride the e-bike fast and they even go at a red light. That’s very dangerous (危险的) . so we should slow down at the traffic lights. At the same time, we must wear a helmet, too. Because it can protect our heads. Do your parents ride e- bike to work? Please tell them to pay attention to the traffic lights and wear a helmet.
1．We must wear2．Don’t go at a
3．The e-bike is very
4．We should pay attention to the
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
