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91.

If the earth's rotation is reversed what would be the PST when it is noon at Greenwich?

A.	6.3	B.	17.3
C.	5	D.	18:30

92.

Which one of the following is the main culprit in the thinning of Ozone layer in the earth's stratosphere?

A.	Carbon dioxide	B.	Chlorofluorocarbons
C.	Nitrogen oxide	D.	Methane