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| A. The boy was short and thin before, but now he is tall and strong. B. Five years ago, my sister was a short girl. But now she is a tall and pretty lady. C. This boy is very polite. He often says hello to the teachers. D. The girl liked singing songs before, but now she likes dancing. E. The boy likes playing football and drawing cartoons now. F. The child always hands in his homework on time. G. The boy had lots of toys. He also liked watching cartoons. H. The boy is surfing the Internet now. I. The girl liked eating candy before. But now she likes eating fruits. |
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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
