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Mark: Hello, Judy. Have you heard the latest news about the elephants?
Judy: 1． What is it?
Mark: A group of elephants are on their way to the north.
Judy: Oh! 2．
Mark: Maybe they are looking for a better place to live.
Judy: How many elephants are there in the group?
Mark: 3．
Judy: Wow! What a big group! But will they hurt people?
Mark: 4． The government has done a lot to protect people and the elephants.
Judy: That’s great news! 5．
Mark: Let’s search on the Internet!
| A．About 15. |
| B．Don’t worry. |
| C．No, I haven’t. |
| D．Why are they moving? |
| E．How can I get more information? |
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
