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Do you know how to fly a kite? Do you know how to make a kite? Can you describe the shapes of kites? Today, people all over the world make and fly kites for fun.
Kites were the first flying machines. People in China used kites as fly machines more than 2000 years ago. In Marco Polo’s report, the Chinese used big kites to carry people up into the sky.
The idea of kites helped people to make planes. In 1894 in Australia, Lawrence Hargrave made four very big kites. These four kites lifted him 5 metres into the air. Today, the wings of planes are just like kites.
Now people around the world use kites in festivals. Kites can have all kinds of colors and shapes, but the most important thing is to fly well.
1．What do people do for fun?2．When did people use as fly machines?
3．How many kites did Lawrence make?
4．How high did those four kite lift Lawrence into the air?
5．Are the wings of planes just like kites?
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
