There is evidence that DHA plays a big role in the intellectual development of humans. In one study, doctors measured the DHA levels of mothers at the time they __56___. Their children were then tested at 12 and 18 months of age to see how well they __57___ things around them. The research team compiled data on __58___ each child focused on a toy. The toddlers ___59__ mothers had the highest DHA levels at birth showed the greatest attention spans. These children focused for longer periods and spent much less time simply ___60__, unfocused. 【題組】56. (A) gave birth (B) gave birth to (C) were given birth (D) were given birth to
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