搜索
Jack is an American boy. He is going to go to his uncle's home tomorrow. His uncle works in Beijing. He is very excited. He wants to buy some presents for his friends in China. He has three penfriends in China. He wants to give them a big surprise. He also wants to visit the Great Wall. He believes(相信)he will have a good time.
1．Jack is from America.2．Jack's father works in China.
3．Jack is going to China.
4．He has three penfriends in China.
5．He will take some presents for his friends in China.
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
