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托福聽力考試素材--闌尾

2018/7/19 16:07:19來源：新航道作者：新航道

雅思/托福/國際備考寒假班

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摘要：得聽力者得托福，備考托福聽力考試中，除了基本的聽力練習之外，還需要多些參考一些背景知識，這有助于各位考生們能取得高分數。下今天，上海新航道托福培訓小編給大家分享一篇關于學科聽力背景知識-闌尾，希望對各位備考托福聽力考試有所幫助。

得聽力者得托福，備考托福聽力考試中，除了基本的聽力練習之外，還需要多些參考一些背景知識，這有助于各位考生們能取得高分數。下今天，上海新航道托福培訓小編給大家分享一篇關于學科聽力背景知識-闌尾，希望對各位備考托福聽力考試有所幫助。

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(淋巴組織).?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.

以上就是托福聽力考試素材，更多關于托福資訊，請關注托福頻道。

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