单项选择题

Americans are still gaining weight though reducing the fat intake because______.

A．they eat regular cookies instead of nonfat ones
B．they eat too much
C．they eat too much sugar
D．they eat low-fat crackers, soups
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单项选择题
Which of the following contains fewer calories
A．Fat.
B．Sugar
C．Protein and carbohydrates.
D．Amino acids.
单项选择题
From Professor Barbara's experiment, we can learn that______.
A．people increase the number of calories they eat per day and gain weight
B．the "low fat" yogurt group ate less calories later than the other group
C．two groups ate the same amount of yogurt
D．people who eat low fat yogurt will not gain weight
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