3. Polar bears need ________________ to catch seals and other marine mammals for food.
II. Read the text and choose the best option (1.25 pts)
Global warming is the rise in the average temperature of the earth (1) _____the
increase of greenhouse gases. Climate scientists now believe that (2) ______ are mainly
responsible for this. The burning of fossil fuels and the cutting down of large areas of
forests have contributed to the (3) _______ of a large amount of harmful gases into the
atmosphere in recent years. The thick layer of these gases traps more heat from the sun,
which leads to the increase in the earth’s temperature.
Global warming (4) _______climate change and catastrophic weather patterns such
as heat waves, floods, droughts, and storms, which can affect human lives. Hundreds of
millions of people may suffer (5) _____ famine, water shortages, and extreme weather
conditions if we do not reduce the rate of global warming.
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