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It was the first day, little Tom went to school. When he came back home, his father asked him, “How many pupils did you find in your classroom, Tom?” ‘‘It’s hard to say.” Tom said, “There were thirty-one when the teacher was in the classroom, and there was none (没有人) when the teacher was out.”
1．Tom went to school for the first time (第一次). （2．Father asked Tom a question. （
3．Tom couldn’t count the pupils. （
4．Tom couldn’t answer his father’s question. （
5．There were thirty-one pupils in Tom’s class. （
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
