41 What will happen when Lake Nyos and Lake Monoun explode?
A Water will flow down the hills
B Poisonous gases will be released suddenly.
C A strong wind will rise from the lakes
D The volcanoes will come to life.
42 Which of the following statements about Lake Nyos and Lake Monoun is true?
A They were formed in 1984.
B They are at the top of two active volcanoes.
C They are not like most other crater lakes.
D Water in them turns over regularly.
43 Lake Nyos and Lake Monoun explode because
A the gases rise to the top and mix with air.
B people from the villages turn over the water.
C scientists have put in a computer system.
D they have more gases trapped at the bottom than other crater lakes
44 A team of scientists has
A erected a pressure-releasing pipe in the lake
B identified the gases at the bottom of the lake
C built a beautiful fountain near the lakes
D removed all dangerous gases from the lakes
45 What do we learn from the last paragraph?
A Scientists are planning to install pipes in all crater lakes.
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