Basic General Knowledge
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

on a cloudy night the clouds are warm and therefore retard the cooling
current of air carry the heat away from the earth on a clear night
the clear sky allows the cold of outer space to reach the earth
the clear sky allows radiant energy to escape readily from the earth

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Basic General Knowledge
The official languages of the United Nations are

African, Chinese, English, French, German and Spanish
Arabic, Japanese, Chinese, English, French and German
Chinese, English, French, Hindi, Japanese and Spanish
Arabic, Chinese, English, French, Russian and Spanish

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