听录音，选出你所听到的短语，每个小题读两遍。( ) 1. A. at seven o'cl

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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，选出你所听到的短语，每个小题读两遍。
(      ) 1. A. at seven o'clock          B. at half past seven          C. at a quarter to seven
(      ) 2. A. in a factory          B. in the fields          C. in the library
(      ) 3. A. ride a horse          B. ride a bike          C. fly a kite
(      ) 4. A. last night          B. every night          C. in the evening
(      ) 5. A. have lunch          B. have dinner          C. have breakfast

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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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