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We should protect the earth. A good environment(环境) makes people feel ________. Trees are helpful. We should ________ more trees. People shouldn’t cut down ________ trees because trees help keep the air clean.
The fish in the river are dead. We should stop factories from pouring ________ water into rivers. We should not drive ________. We should save ________. There is not much coal ________ oil on the earth. We can go to school ________. Plastic is bad ________ the earth. We should use paper bags and glass bottles.
We can ________ the world a better place to live.
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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
