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It’s important(重要的) for us to be polite at school. In the class, we shouldn’t(不应该) talk or play with others when the teacher is talking. If we have some questions, we should(应该) put up our hands and wait for the teacher to tell us to speak. We should help others when they are in trouble. We should often say “please” and “thank you” to others. Let’s be polite to others!
1．When the teacher is talking, we should ______. ( )| A．be quiet | B．talk and play with others |
| A．put up your hands | B．stand up |
| A．have lunch together | B．help each other |
| A．How to make friends | B．How to be polite at school |
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
