听录音，选择正确的答句。(听两遍) ( ) 1. A. I like reading boo

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类型：听音，选择正确答案

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所属科目：小学英语

听录音，选择正确的答句。(听两遍)
(     ) 1. A. I like reading books.       B. We are going to do a science project.       C. We went to the zoo.
(     ) 2. A. They are new.                  B. They are my parents.             C. They're on Shelf C.
(     ) 3. A. Thank you.                      B. That's a good idea.                 C. You're welcome.
(     ) 4. A. No, they aren't.                 B. Yes, I did.                            C. No, it isn't.
(     ) 5. A. They're dictionaries.          B. They are 12 years old.            C. They live in a big house.

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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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