A daily multivitamin may give your well－being an extra benefit，but if you’ve ever swallowed one and felt sick right after，you know it’s hardly a pleasant experience. __1.__
◆You’re taking vitamins on an empty stomach.
Vitamins that are more acid in nature，like vitamin C，may cause nausea(恶心)if they’re consumed on an empty stomach.Vitamins A，D，E and K，unlike some others，may be better absorbed when not taken with food.
◆ __2.__
Vitamins are like medicines in that they can act on each other and other medicines you’re taking. __3.__ Some research suggests that multivitamins could cause side effects when taken at the same time with high estrogen(雌激素)levels.
◆There’s a lot of iron in your pill.
Multivitamins that contain a lot of iron or iron supplements themselves can cause nausea.This is especially true if you’re taking them outside of a meal.Iron is interesting in that it’s best absorbed on an empty stomach，but it’s hardest to take on an empty stomach because of the nausea. __4.__ It might decrease the absorption a little bit but it’s better than nothing.
◆Allergic reaction side effects.
Since multivitamins contain so many vitamins and minerals，allergic reactions are certainly possible.Mild allergic reactions can include itchiness(痒) and a few hives(荨麻疹). __5.__ Should you experience more advanced signs of an allergic reaction，such as trouble breathing，chest pain，widespread hives or a swollen facial region，visit the closest emergency room immediately.
The lable on your vitamins should provide directions for taking them.Check the information before taking them to see what else you should know.
A．You’re taking vitamins with other medicines.
B．Below are a few reasons why multivitamins may be making you ill.
C．It’s important to discuss with an expert the timing of these vitamins.
D．These stomach issues can be extremely disturbing.
E．It’s better to take it with food than trying taking it on an empty stomach.
F．If you experience these side effects，stop use and contact your doctor.
G．Please review the combinations to make sure there are no harmful interactions.
文章大意：本文主要讲述了服用多种维生素可能让人感到不适的几种原因。
3.G 解析：本句出现在段落中间，起到承上启下的作用。上文讲的是，各种维生素之间以及维生素与其他药物之间会相互作用；下文讲的是，当雌激素水平高时服用多种维生素可能引起副作用，所以G项符合语境。G项的意思是“请检查一下混合物(多种维生素)，确保它们之间没有有害的相互作用”。
4.E 解析：本句出现在段落中间，起到承上启下的作用。上文讲的是，多种维生素中的铁在空腹时服用吸收效果是最好的，但空腹服用会让人恶心；下文讲的是，这可能会吸收得少一点，但总比一点也不吸收要好，所以E项符合语境。E项的意思是“比起试图空腹服用来说，跟食物一起服用多种维生素更好一些”。
5.F 解析：本句出现在段落中间，起到承上启下的作用。上文讲的是，轻微的过敏反应症状；下文讲的是较重的过敏反应症状，所以F项“如果你感受到了这些副作用，就不要服用了，要联系你的医生”符合语境。
