推定的主要特征是什么？

国际上推广使用中国的铁锅，这是因为铁锅　 [ ]

A．是单质，导热性能好

B．含碳，属于混合物　

C．化学性质活泼

D．易使食物中含人体所需要的铁元素

销售量大、面广的商品一般适用( )的分销渠道。

A．长渠道

B．短渠道

C．宽渠道

D．窄渠道

阅读理解.

                                        How to Become a Better Student

     Maybe you are an average student.You probably think you will never be a top student.

This is not necessarily so，however.Anyone can become a better student if he or she wants

to.Here is how.

     Plan your time carefully.

     When planning your week，you should make a list of things that you have to do.After

making the list，you should make a schedule of your time.First arrange your time for eating，

sleeping，dressing，etc..Then decide a good，regular time for studying.Don’t forget to

set aside enough time for entertainment.A weekly schedule may not solve all the problems，

but it will force you to realize what is happening to your time.    

     Find a good place to study.

     Look around the house for a good study area.Keep this place，which may be a desk

or simply a corner of your room，free of everything but study materials.No games，

radios or TV！When you sit down to study，concentrate on the subject.

     Make good use of your time in class.

     Take advantage of class time to listen to everything the teacher says.Really listening in

class means less work later.Taking class notes will help you remember what the teacher says.

     Study regularly.When you get home from schools，go over your notes.Review the

important points that your teacher has mentioned in class.If you know what your teacher is

going to discuss the next day，read the material.This will help you understand the next

class.If you do these things regularly，the material will become more meaningful，and you

will remember it longer.

     Develop a good attitude about the tests.The purpose of a test is to show what you

have learned about a subject.They help you to remember your new knowledge.The world

won’t end if you don’t pass a test，so don’t be overly worried.There are other methods that

might help you with your studying.You will probably discover many others after you have

tried these. 

1．Accordingtothetext,aschedulemayNOTinclude________.

A．alistofthingsyouhavetodo

B．whatyouhavetodoeveryday

C．enoughtimeforentertainment

D．somethingwillhappenunexpectedly

2．Agoodplaceforstudyshouldbeaplacewhere________.

A．everythingneededisavailable

B．awritingdeskisinthecornerofaroomonly

C．nothingisthereexceptyourstudymaterials

D．itiscomfortabletostay

3．ThelastsentenceinTip5suggests"________"．

A．Testsarethemostnecessaryartinyourstudy

B．Takeatestasafriendinneedinyourstudy

C．Theworldwillcometoanendunlessyoupassalltests

D．Neverletteststroubleyouinyourstudy

4．WhichofthefollowingisNOTtrue? 

A．Readingmaterialsinyourtextbookbeforeclasswillhelp.

B．Inthewriter'sopinion,therearefivemethodsforyourstudy.

C．Itisnecessarytogooveryournotesathome.

D．Therearemanyothermethodsbesidesthosementioned.

为了减少磨损，柴油机不允许在不安装（）的情况下工作。

A.冷却水过滤器

B.空气除湿器

C.空气滤清器

D.空气除氮气

侵犯商标权的行政责任是（）

A.停止侵权

B.赔偿损失

C.行政罚款

D.刑事拘留