托福听力考试素材--阑尾|上海新航道

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托福听力考试素材--阑尾

2018/7/19 16:07:19来源：新航道作者：新航道

雅思/托福/国际备考寒假班

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摘要：得听力者得托福，备考托福听力考试中，除了基本的听力练习之外，还需要多些参考一些背景知识，这有助于各位考生们能取得高分数。下今天，上海新航道托福培训小编给大家分享一篇关于学科听力背景知识-阑尾，希望对各位备考托福听力考试有所帮助。

得听力者得托福，备考托福听力考试中，除了基本的听力练习之外，还需要多些参考一些背景知识，这有助于各位考生们能取得高分数。下今天，上海新航道托福培训小编给大家分享一篇关于学科听力背景知识-阑尾，希望对各位备考托福听力考试有所帮助。

In?human?anatomy,?the?vermiform?appendix?(or?just?appendix)?is?a?small?sac?connected?to?the?large?intestine.?It?was?once?believed?to?be?a?useless?and?purely?vestigial?organ;?but?newer?evidence?suggests?it?most?likely?has?a?function?in?the?lymphatic?system.?It?is?one?of?a?number?of?areas?of?the?colon?where?lymphatic?tissue?is?present;?but?in?the?appendix?it?is?present?in?a?particularly?high?proportion,?although?it?degenerates?with?age?and?comes?to?resemble?other?areas?of?lymphatic?tissue?in?the?colon.

?The?appendix?is?a?small?tube?located?at?the?end?of?the?caecum,?the?first?part?of?the?large?intestine.?It?is?called?vermiform?appendix?as?it?resembles?a?worm.?It?is?usually?eight?to?ten?cm.?long.?Its?structure?is?made?of?the?same?tough?fibrous?outer?covering?as?protects?the?entire?alimentary?canal(消化道).?There?is?a?layer?of?muscular?tissue?under?the?outer?covering?and?further?a?layer?of?lymphoid?tissue(淋巴组织).?The?function?of?the?appendix,?which?is?performed?by?this?lymphoid?tissue,?is?to?neutralise?the?irritating?waste?material?generated?in?the?body?or?the?organic?poisons?introduced?through?the?skin?or?membranes.

以上就是托福听力考试素材，更多关于托福资讯，请关注托福频道。

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