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Tommy and Jack are brothers. They are twins. They study in the same class. Jack studies better than Tommy.
One day, the teacher asks the students to write a composition. The name of it is "My Mum".
Jack finishes his composition, "Please let me have a look at your composition," Tommy says. Jack gives it to Tommy.
The next day, the teacher says to Tommy, "Your composition is the same as Jack's.
"Why?"
"Because we have the same mother," answers Tommy.
1．Jack and Tommy are twins and study in the same class.2．Tommy studies better than Jack.
3．Jack asks Tommy to copy（抄写）his composition.
4．The teacher finds the two compositions are the same.
5．The teacher will be happy with Tommy's answer.
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
