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He's Right
Daming rides his bike to go to school. He puts it in the yard of the school. There are many bikes there. After school the students take their bikes and go home by bike. Sometimes a policeman stops them all and lets the cars go by. Some students carry heavy bags of books with them. One day, Da Ming and Li Lei are on one bike. The policeman stops them. Li Lei is angry. " I'm tired. Let us go!" he shouts at the policeman. "Don't shout at him. " Daming says, "He's right. "
1．Who stops the bikes and lets the cars go by? _____.
| A．A policeman. |
| B．Da Ming and Li Lei. |
| C．No one. |
| A．They carry many bags. |
| B．They carry many books with them. |
| C．They carry heavy bags of books with them. |
| A．They ride the two bikes. |
| B．Tom rides a bike and Jack rides a bike. |
| C．They are on the same bike. |
| A．The student. |
| B．The policeman. |
| C．Daming and Li Lei. |
| A．On foot. | B．By bus. | C．By bike. |
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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
