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（1）I’m from China.
（2）Where are you from?
（3）I know China .It is a beautiful country.
（4）I’m from the USA.And you ?
（5）Hello，Mike.Nice to meet you.
（6）Hi,Tom. This is Mike.
（7）Welcome to our country.
（8）Nice to meet you ,too.
（9）Thank you!
( )A. 6 5 8 2 4 1 3 7 9
( )
| A．6 5 8 2 4 3 7 9 1 |
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
