17.Ever wonder why sometimes a hug is all you need?You can't explain it,but there's just something comforting about being in your wife's arms after a rough day or giving mom a hug after a long time apart.
A new study says the warm feeling in a hug is more than just skin deep.Researchers from the University of California,Berkeley believe that this loving feeling could have anti-aging benefits.
Oxytocin,sometimes referred to as the"love hormone(荷爾蒙)"or the"trust hormone",is responsible for those indescribable feelings we get when we're bonding with a lover or a loved one.
Levels of the hormone drop as we age,and evidence suggests that could be a contributing factor to the deterioration of our bodies as we age.Muscle loss in particular is one of the major side effects of aging,with our bodies losing up to 5percent of our muscle mass each decade past our 30s.
In the study,published in the journal Nature Communications,researchers injected oxytocin into older mice with muscle damage.The older mice had lower levels of the hormone than younger mice initially.But after nine days,the older mice that were given the hormone healed better than those who did not.In fact,their ability to repair muscle damage was up to 80percent that of the younger mice.
The results were not only fast-acting,but provide hope for future uses of the hormone in a variety of anti-aging capacities."This is good because it demonstrates that extra oxytocin improves aged tissue stem cells(組織干細(xì)胞)without making muscle stem cells divide uncontrollably,"study co-author Wendy Cousins said in a statement.
Previous uses of anti-aging molecules have also been associated with higher cancer risk,but researchers are hopeful that oxytocin can be useful in humans without this risk.In the future,researchers of Berkeley say oxytocin could be used to fight other age-related health issues by improving bone health and even being used as an alternative to hormone replacement therapy.
Now go out and give someone a hug.
33.According to the passage,oxytocinA.
A.decreases when people get older
B.creates loving feeling on the skin
C.leads to the great loss of muscles
D.can be used in humans without any risk
34.The underlined word"deterioration"in Paragraph 4probably refers to the state ofB.
A.getting fatter
B.becoming worse or less
C.growing stronger
D.dividing uncontrollably
35.What can be learned from the research?D
A.All the older mice healed faster in the research.
B.Older mice healed better than younger ones after 9days.
C.Extra oxytocin in older mice controlled muscle cell division.
D.Mice with oxytocin injection improved the ability to repair muscle damage.
分析 文章大意:本文是一篇說明文,說明了擁抱的力量,它比直接的肢體接觸感覺更好,它能產(chǎn)生一種讓人舒適的荷爾蒙,并且還做了實驗進(jìn)行了證明.
解答 33.A 細(xì)節(jié)理解題.根據(jù)第四段第一句話Levels of the hormone drop as we age可知荷爾蒙隨著年齡的增長而下降,因此選A.
34.B 詞義猜測題.前面指出荷爾蒙隨著年齡的增長而下降,而這也是導(dǎo)致身體變差的原因.因此答案選B.
35.D 推理判斷題.根據(jù)文章第五段最后兩句話But after nine days,the older mice that were given the hormone healed better than those who did not.In fact,their ability to repair muscle damage was up to 80percent that of the younger mice可知年老的老鼠有了荷爾蒙之后,肌肉損傷好得很快,因此答案選D.
點評 本文是歷史文化類閱讀理解.這類題材是高考?嫉膬(nèi)容之一,它注重考查考生總體理解把握大意以及結(jié)合語境做出合理推斷的能力,要求考生做題時要在把握大意的基礎(chǔ)上結(jié)合題目做出正確的選擇.