听录音，选择你听到的单词或词组。( ) 1. A. smaller B. lon

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类型：听音，选择听到的内容

难度系数：0.85

所属科目：小学英语

听录音，选择你听到的单词或词组。
(     ) 1. A. smaller       B. longer               C. heavier
(     ) 2. A. bookstore       B. supermarket              C. hospital
(     ) 3. A. wear warm clothes       B. see a doctor              C. go to the hospital
(     ) 4. A. took many pictures       B. bought gifts              C. stayed in the hotel
(     ) 5. A. How old are you?       B. How heavy are you?        C. How tall are you?

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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

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2019-09-19

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2019-09-19

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