问题 选择题

脂肪必须经消化后才能被人体吸收.人体内消化脂肪的器官、所需要的酶、消化的终产物、吸收器官分别是(  )

A.胆囊、胆汁、脂肪微粒、胃

B.肝脏、胆汁、甘油和脂肪酸、小肠

C.小肠、胆汁、甘油和脂肪酸、小肠

D.小肠、肠脂肪酶和胰脂肪酶、甘油和脂肪酸、小肠

答案

脂肪的消化开始于小肠,小肠内的胰液和肠液中含有消化脂肪的酶,同时,肝脏分泌的胆汁也进入小肠,胆汁虽然不含消化酶,但胆汁对脂肪有乳化作用,使脂肪变成微小颗粒,增加了脂肪与消化酶的接触面积,有利于脂肪的消化,脂肪在这些消化液的作用下被彻底分解为甘油和脂肪酸;甘油和脂肪酸通过消化道壁进入小肠绒毛内的毛细淋巴管里,然后经过淋巴循环进入血液循环;即脂肪被消化的器官、所需的酶、消化后的成分、吸收的器官分别是小肠、消化脂肪的酶、甘油和脂肪酸、小肠.

故选:D

名词解释
阅读理解

阅读理解。

     You've attended all the classes,done all of your homework and you think you have grasped

the material.But then the day of the test comes.Suddenly,you feel so nervous that you can't answer

those questions you knew the answers to just last night.If this sounds like you,you may have a

case of test anxiety (焦虑).

     Test anxiety can be a real problem.When someone is stressed out over a test,he or she

may not be able to do his or her best work.Feeling ready to meet the challenge,though,can keep

test anxiety at a proper level.

     Use a little stress to your advantage.Stress is your body's warning mechanism (装置)-it's

a signal that helps you prepare for something important that's about to happen.Instead of worrying

too much about the test,take  an active way.Let stress remind you to study well before a test.Then

you'll stop your stress from being out of control.

     Ask for help.Although a little test anxiety can be a good  thing,too much of it is another story

entirely.If sitting for  a test makes your mind go blank and causes you to miss answers that you know,

then your level of test anxiety  probably needs some attention.Your teacher,your parents,or a tutor

can be a useful resource to talk to if you always get too much test anxiety.

     Be prepared.Many students find that their  test anxiety is  reduced when they start to study better.

It works-the better you know the material,the more confidence you'll have.

1.What is this passage mainly about?

A.What should be done before a test.

B.How to deal with test anxiety.

C.What causes test anxiety.

D.What test anxiety is.

2.The underlined word "grasped" in Paragraph 1 probably means________.

A.received    

B.passed

C.understood  

D.finished

3.From Paragraphs 2 and 3 we can learn that________.

A.it's hard to keep test anxiety at a proper level

B.test anxiety cannot be avoided

C.only lazy students have test anxiety

D.a little test anxiety might be helpful

4.In Paragraph 4,the writer suggests a student who feels too nervous before a test should________.

A.find a quiet place to relax for a while

B.talk to someone to get over the anxiety

C.have a good time with some friends  

D.find out if others feel the same

5.What can we infer from the passage?

A.Test anxiety is a kind of serious illness.

B.Getting prepared can reduce test anxiety.

C.Only teachers can help students get over test anxiety.

D.The more tests a student has,the less anxiety he/she will have.