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It’s the last lesson before the holiday . The students are very happy . Their English teacher is very happy , too . He plays some nice games with them and sings some nice songs with them . Then he goes to the blackboard and writes “smiles” on it .
“This is one of the longest words in English.” He says .
All the students laugh and then one of the girls stands up and asks “Why is it one of the longest words in English?”
The teacher says nothing for a few seconds(秒). Then , he smiles and says“Because the word is a mile (英里)between the first letter and the last .”
（1）The holidays is coming . The students are happy .
（2）Only the students sing the songs.
（3）The teacher writes “laugh” on the blackboard .
（4）The teacher says “smiles” is one of the longest words in English .
（5）A boy asks the teacher a question .
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
