学进去-教育应平等而普惠
试题
类型:用单词的正确形式完成短文
难度系数:0.65
所属科目:初中英语
阅读短文, 从方框中选择适当的单词成单词的正确形式填空。(每词限用一次)
popular   start   of   population   food

Do you eat rice every day? Rice is the most important 1. for people all over the world. According to a survey, rice helps feed one third of the world’s population.

Scientists say that China 2. growing rice about 3,000 to 4,000 years ago. Now, rice is common in people’s daily meals. Rice can be boiled or steamed(蒸). Snacks made 3. rice are very delicious. Rice is also a 4. food on festivals. People make New Year cakes with sticky rice (糯米) every Spring Festival.

China has the largest 5. in the world. In order to feed more people, Chinese scientist Yuan Longping led the Super Rice program in 1996. Today half of China’s rice plants are Yuan’s Super Rice.

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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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