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A recent report shows many people’s habits have changed during the period of staying at home. Although everyday social lives have returned now, some habits still remain in our daily life.
1．From the report we know many people have online classes at __________.
| A．8:00 a.m. | B．8:00 p.m. | C．9:00 a.m. | D．9:00 p.m. |
| A．stay away from others | B．save some money |
| C．get the food faster | D．keep the food fresh |
| A．keeping pets | B．travelling abroad | C．learning languages | D．eating at restaurants |
| A．School World. | B．Social Life. | C．Sports Field. | D．Science Study. |
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
