Basic General Knowledge
The exhaled air contains

a mixture of carbon dioxide and nitrogen
carbon dioxide only
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
a mixture which has more carbon dioxide than oxygen

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Basic General Knowledge
The main objectives of the UN are

to develop friendly relations among nations
to maintain peace and security in the world
All of these
to work together to remove poverty, disease and illiteracy and encourage respect for each other's rights of basic freedom.

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