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In today’s world, almost everyone knows that air pollution and water pollution are harmful to people’s health. However, not all people know that noise is also a kind of pollution, and that is harmful to human health, too.
People who work and live in noisy conditions usually become deaf. Many workers who print newspapers and books become deaf. Quite a few people living near airports also become deaf.
Recently it was discovered that many American children’s hearing is as bad as 65-year-old people’s, for these children like to listen to pop music and most pop music is noisy. Besides, noise produced by planes or machines will make people’s life difficult and unpleasant, or even make people ill or drive them mad.
Now the governments in many countries have made laws to control noise. In China, the government is trying to solve not only air and water pollution problems but also noise pollution problems.
1．Everyone knows noise is a kind of pollution.| A．Right. | B．Wrong. |
| A．Right. | B．Wrong. |
| A．Right. | B．Wrong. |
| A．Right. | B．Wrong. |
| A．Right. | B．Wrong. |
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
