第二节（共5小题；每小题2分，满分10分）
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Parents and doctors have the same worry over especially low birthweight newborns. _71__A trend has therefore developed to make special formulas（配方）of extra nutrients and protein-rich foods for these tiny babies. Unfortunately, a British study has found that this practice could have negative long term effects, such as high blood pressure in adulthood.
