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1	The production of concrete accounts for roughly what percentage of global carbon dioxide emissions?
	A)	1%
	B)	5%
	C)	10%
	D)	15%
2	The nanostructure of cement:
	A)	refers to the arrangement of its atoms
	B)	was determined using atomic force microscopy
	C)	results in its high density
	D)	b and c
	E)	all of the above
3	Based upon their data, the scientists suggest:
	A)	using a different mineral in cement would reduce its high density
	B)	using a different mineral in cement would reduce the amount of heat necessary to create cement
	C)	using a different mineral in cement would reduce the emission of carbon dioxide in the cement making process
	D)	b and c
	E)	all of the above