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Did you know that the first bicycle weas for sport and pleasure? Some of the 1． bikes were toys for the rich. Today, people ride for many different 2． Children ride bikes for fun. Your mum or dad may 3． to work or to the store. Some people, such as bicycle postmen, even use bikes to do their job.
The professional cyclists(自行车运动员) made the sport of cycling 4．. These players spend their time 5． and competing in national and international cycling events. They appear on television. They are front-page news in newspapers. Some have become the new athletes of the year in sports 6．.
But there is one professional cyclists 7． changed cycling history. He is Lance Armstrong. He won the Tour de France six times. The Tour de France is the greatest race in cycling. No one has 8． won this race so many times. But there’s more. In his cycling career(事业), Lance 9． to overcome cancer(癌症). As a cancer survivor(幸存者), Mr. Armstrong made the greatest comeback 10． cycling history.
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
