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六级考试真题题库及答案

一、单项选择题（总共10题，每题2分）

1.Thehumanbrainconsumesaboutwhatpercentageofthebodystotalenergy?

A.10%

B.15%

C.20%

D.25%

2.WhichofthefollowingisNOTapartofthehumancirculatorysystem?

A.Heart

B.Lungs

C.Veins

D.Arteries

3.Whatistheprimaryfunctionofredbloodcell