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（______） 16. A. He did his homework and watched TV.
B.He cleaned his room and washed his clothes.
C.He went camping and rode a horse.
（______） 17. A. It was great. B. It was bad. C. It was OK.
（______） 18. A. 80kg. B. 8kg. C. 18kg.
（______） 19. A. A worker. B. A pilot. C. A teacher.
（______） 20. A. To the cinema. B. To the supermarket. C. To the bookstore.
同类型试题
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
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
