国家开放大学 / 综合英语（1）
正确率：100%
By “if the fuel isn’t there, the spark is useless”, the author attempts to mean “ _ _ _ _ ”
a.Without carbohydrates, protein and fat, vitamins and minerals are of no use.
b.Carbohydrates, protein and fat are enough to sustain a human life
c.Vitamins and minerals are virtually of no value
d.Carbohydrates, protein and fat are as important as vitamins and minerals
a.Without carbohydrates, protein and fat, vitamins and minerals are of no use.
b.Carbohydrates, protein and fat are enough to sustain a human life
c.Vitamins and minerals are virtually of no value
d.Carbohydrates, protein and fat are as important as vitamins and minerals
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