The world's population exceeded ________ in 2013.
A) 10 million people
B) 600 thousand people
C) 7 billion people
D) 67 billion people
Correct Answer:
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Q38: Which of the following is mentioned in
Q39: Depletion of the ozone layer is caused
Q40: Exposure to indoor air pollution increases the
Q41: Scientific evidence shows that global warming is
Q42: If greenhouse gases stabilize, global air temperature
Q44: Which of the following contributes to carbon
Q45: Sufferers of _ often avoid public places
Q46: _ involves injecting a mixture of water,
Q47: Light pollution refers to
A)annoying, unnecessary and/or harmful
Q48: According to the text, _ can remain
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