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In the text, the word “Throughout” (line 13) can be correctly replaced by In all of.
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According to the text, since the Industrial Revolution of the 1800s the level of CO2 in our atmosphere has decreased.
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The word “amounts”, in “Higher amounts of CO2 make the atmosphere denser” (lines 10 and 11), can be replaced, without
changing its meaning, by nodes
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The greenhouse gas is a gas that traps heat in the atmosphere and is the cause of global warming
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According to the text, oceans are carbon sinks and, because of this, the ocean’s water is becoming more alkaline.
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The expression “take up”, in “Plants use the sunlight and take up the CO2” (line 5), can be replaced, without changing its
meaning, by absorb
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The word “dizziness”, in “High concentrations can lead to dizziness” (line 23), can be correctly replaced by lightheadedness.
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In the text, the words “Throughout” (line 13) and “Although” (line 22) are synonyms