In today’s class, the teacher gave every student a list of animals in danger. Seeing that, Tony asked Jacob in a low voice, “There are so many animals in danger. Do you know any of
Jacob nodded. “Yes. I know blue whales. My sister is a biologist, a scientist who studies animals in the wild. She once told me about blue whales. They’re the
As soon as he came home, Tony used his computer
While Tony
“We’re learning about endangered animals, and the blue whale is one of them,” said Tony, “People hunt them for meat and oil.
“That would be awful,” replied Tony’s mother.
Thinking for a while, Tony said excitedly, “Mom, I know I want to be a biologist when I grow up! I
Tony is a kind boy. What’s your ideas about the animals in danger? What will you do to help them? How about talking with your friends after class?

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

