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A father asks his son, "How many letters are there in the alphabet?" "I don't know," says his son. His father says, "You don't know? You are in school for many years and you don't know how many letters there are in the alphabet?" He is very angry. His son says, "No. But let me ask you a question, Dad. You often go to the post office, please tell me how many letters there are in the post office?"
1．From this story, we know the son is good at English.2．The son studies at school over (超过) one year.
3．The father gets angry because his son is not polite (有礼貌) to him.
4．The father knows how many letters there are in the post office.
5．There are twenty-six letters in the alphabet.
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
