1) Trees are very important for our world, because ....................................... a) They are harmful for us b) They produce oxygen c) They kill wild animals d) People should cut down trees 2) .............................. has effect on human life such as rising temparatures, rising sea levels and melting glaciers. a) Global warming b) Wind and solar energy c) Air pollution d) Killing wild animals 3) Which of the following is false? a) We should use filters in factories. b) We should turn off the lights when we don't use them c) We should plant trees d) We should cut down trees 4) Which of the following is true? a) We should kill the elephants for ivory b) We should throw rubbish around c) We should recycle materials d) We shouldn't use eco-friendly bags

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