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Did you know that there are only 50 blue whales in the world now? Did you know that we can no longer see any South China Tigers on the earth? Did you know that thousands of animals are disappearing?
The tiger is one of the strongest and most beautiful animals in the world. Before, tigers could be found in Russia, India and East Asia. But now there are not more than five thousand tigers in the world. People kill tigers for their skins and use their bodies for medicine.
African elephants are the biggest animals on land. They live in family groups. They are strong and clever. But they are dying out too. People in Africa cut down the trees and the elephants have no place to live. Water pollution brings problems to the elephants too. Some people kill elephants for their tusks. They sell elephant tusks for money. No trading (交易), no killing. Let’s work together and try our best to save the animals in danger.
1．_______ are disappearing. ( )| A．Tigers and African elephants | B．South China Tigers and blue whales | C．Both A and B |
| A．South Africa | B．Australia | C．Russia, India and East Asia |
| A．more than 5,000 | B．less than 5,000 | C．less than 500 |
| A．people cut down the trees | B．air pollution brings problems to them | C．people kill elephants for their skins |
| A．cutting down the trees | B．polluting the oceans | C．never buying things made from animals |
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
