A. a horn-like material
B. dead cells
C. useless portions of the body
D. not connected with the blood stream
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A. veins to arteries
B. heart to lungs
C. arteries to veins
D. heart to the body
A. go to sleep immediately and rest
B. take a long walk
C. take some vitamins
D. read interesting articles
A. blood
B. kidneys
C. skin
D. liver
A. proteins
B. fats
C. vitamins
D. carbohydrates
A. enters the stomach
B. reaches intestines
C. enters the mouth
D. thoroughly mixes
A. burning
B. explosion
C. sudden expansion
D. sudden contraction
A. drops
B. rises
C. remains constant
D. becomes unpredictable
A. activated by man
B. naturally activated
C. chemically activated
D. absolutely inactivated
