5. The word shallow in the passage mostly means __________. ʻ ʼ
A.not clear B.tidal C.coastal D.not deep
B. Read the passage and then decide if the statements are true (T) or false (F)
There are three main kinds of pollution – air pollution, water pollution, and noise pollution. Air,
which is the most important element of our environment for our survival, can be polluted in many
ways. Smoke in the air from mills, factories, and industry contains carbon monoxide, carbon
dioxide, and methane, which are all poisonous gases. This leads to health problems like asthma and
lung diseases, and the thinning of the ozone layer, which protects us from harmful UV rays. China,
the USA, Russia, India, Mexico, and Japan are the world leaders in air pollution emissions. Water is
also polluted by the discharge of commercial and industrial waste into surface water. Sewage in
drinking water is another cause of water pollution as it contains germs and viruses. The noise of
vehicles, mills, and factories can be really unbearable. This kind of constant sound also causes
headaches, tension, mental stress, and migraines. People living next to a building site where there is
too much noise can become sick, as they cannot sleep or relax. This is called noise pollution.
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