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Eric is a middle school boy. His father has a black car, so his father usually d1． him to school in the car. Eric’s best friend Henry goes to school by 2．, because he thinks it is good for his health. So Henry often a3． Eric to ride a bike with him together. Eric thinks Henry is r4．.
Eric s5． to his mother, “Mum, would you please b6． a bike 7． me?” His mother smiles and asks, “8． do you want to ride a bike to school?”
“First, it’s good for my health. S9．, there are a lot of traffic jams (交通堵塞) on the road, so it is faster (更快的) to ride a bike.” “OK. Let’s go to the bike shop and choose (挑选) one. But you must be careful when you ride on the s10．.”
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
