不定项选择关于电场线的说法，正确的是（ ） A．沿着电场线的方向电场强度越来越小

                                                    Instruction
Take three times a day after meals.
Dose (剂量): Grown-up: 2 spoons each time
                    Children: 8-12 years: one spoon;
                                  4-7 years: 1/2 spoon 
Not fit for children below the age of 4 years.
Notes: 1.Keep it in a cold place. 
          2. Using before Dec.2008.
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