搜索
Jack is a student and he is fourteen. Today is his birthday. In the morning his parents give him a nice present—a new red bike. Jack is very happy. After breakfast, he goes to school by bike.
His classmates all say,“What a nice bike!”Jack smiles and says,“Thank you. The bike can save (节省) me 30 minutes on the way to school.”One of his friends says, That’s good. Happy birthday, Tom! But if you have two bikes one day, they can save you the whole (全部的) time on the way to school, right?
（1）The birthday present is a new red bike.
（2）Jack goes to school by bike on his birthday.
（3）Jack’s classmates don’t think the bike is nice.
（4）The bike can save Jack 30 minutes on the way to school .
（5）Two bikes can save Jack the whole time on the way .
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
