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A Delicious Bird
A rich (富有的) man wants to give his mother a birthday gift, but what will be the best one? One day he finds an amazing bird in the market. It can talk in twelve languages (语言) and sing ten famous opears (歌剧). He buys the bird quickly and sends it to his mother. It costs him $50,000.
The next day he phones to his mother, “What do you think of the bird. Mother?”
“Oh, it’s very delicious,” his mother answers.
1．The rich man sends his mother a birthday gift.2．The bird can sing two famous operas.
3．The bird is very expensive (昂贵的).
4．The rich man finds a gift.
5．His mother thinks the bird is clever.
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
