只写5个不一样的空即可。
Can we be too clean? According to what’s called the hygiene ____1____, yes. Without being challenged as kids, our immune systems don’t flourish. Scientists think it could be part of the rise of allergies and asthma.

Now a new study supports the hygiene ____1____: infants in Uganda had a lower chance of developing the skin allergy condition eczema if their moms had helminth worm infections while pregnant. The research is in the journal Pediatric Allergy and Immunology.

A 2005 study showed that the kids of women treated for worm infections had more eczema. Twenty-five hundred pregnant women took part in this ____2____ research. Some got one worm-killing drug. Others took a different drug. And a third group received a placebo. One drug nearly doubled the kids’ risk of eczema. The other more than doubled the ____3____.

Helminth worm infections can give the mothers symptoms such as mild anemia or stomach pain and ____4____. Although many people have no symptoms at all. The scientists say more research is needed before they would recommend not treating worm infections. But the work lends additional support to the idea that hygiene may be a ____5____ rather than a goal.
【视听版科学小组荣誉出品】
hypothesis follow-up odds vomiting balancing act
我们是否太干净了？根据所谓的卫生假说，的确太干净了。由于孩童时期没有怎么受到病菌感染，我们的免疫系统并未健康成长。科学家认为这可能是变态反应和哮喘病例增加的原因之一。 现在一项新研究表明卫生假说是正确的：在乌干达，如果母亲在怀孕期间受到蠕虫感染，宝宝将来患过敏性皮肤湿疹的几率就降低了。这项研究刊登在《小儿过敏和免疫学》杂志上。 2005年一项研究显示，治疗蠕虫感染的小孩和妇女更容易得湿疹。250名怀孕妇女参与了这项跟踪研究。一部分人服用某种抗虫药物，一部分人服用另一种抗虫药物，而第三组人则服用安慰剂。若母亲服用第一种药物，孩子患上湿疹的几率几乎增加了一倍，若母亲服用第二种药物，孩子患上湿疹的几率则增加了一倍多。 感染蠕虫的母亲可能会有某些病症，比如说轻度贫血、胃痛和呕吐。但也有人什么反应都没有。科学家表示，他们需要做更多的实验，才能决定释是否建议人们不要治疗蠕虫感染。但这项研究更加表明这种观点是正确的：保持卫生应该适度，不要把干净当做人生目标。