学进去-教育应平等而普惠
试题
类型:用单词的适当形式完成短文
难度系数:0.94
所属科目:高中英语
阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

People need transportation to move from one place to another. As time went by, transportation methods improved. Especially after the invention of airplanes, they made travel more convenient and 1. (easy).

The airplane 2. (invent) by Orville and Wilbur Wright in 1903. 3. first airplane, Wright Flyer I, flew 36.5 meters in 12 seconds. After that, the two brothers kept 4. (improve) their airplanes. They flew in public in France in 1908, and started taking passengers with them. From then on, many other people made great efforts 5. (develop) airplanes. Thanks to their efforts, airplane technology developed 6. (extreme) fast.

Today, airplanes have many different 7. (apply). People can use airplanes to travel to other countries, send urgent mails and help people 8. danger. They use airplanes to send water, food, medicine, etc. to cities that need help. However, airplanes are not only used in positive ways, 9. they are also used to fight wars.

Many things 10. (change) since the invention of the airplane. Airplanes have made travel or transport faster. Airplanes have really changed our lives.

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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

用户名称
2019-09-19

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

用户名称
2019-09-19
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