11- 2ND MID TERM REVISION
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11- 2ND MID TERM REVISION Exercise 4 Read the following passage and then choose the correct answer A, B, C or D (1.5p). One of the most urgent environment problems in the world today is the shortage of clean water. Having clean drinking water is a basic human right. But acid rain, industrial pollution and garbage have made many sources of water undrinkable. Lakes and even entire seas have become vast pools of poison. Lake Baikal in Russia is one of largest lake in the world. It contains a ric