The experiment proved to be satisfactory．（）

单项选择题Dehydration may occur if there is a shortage of water（）

A.in your body
B.without water
C.before long
D.for a change
E.on a busy day
F.to your weight

单项选择题Paragraph 2（）

A. Ounces of Water Needed Per Day 　　
B. Importance of Water 　　
C. Composition of Water 　　
D. Signs of Dehydration 　　
E. Supply of Water 　　
F. Necessity for Bringing a Bottle for Water with You