Many bad habits can be especially difficult to cure because they are likelyto have been formed at a very young age．．许多坏习惯特殊气味难以纠正.因为它们可能是人们在年幼时就形成了的．题目和参考答案——青夏教育精英家教网—

题目内容

4．Many bad habits can be especially difficult to cure because they are likelyto have been formed at a very young age．（form）．
许多坏习惯特殊气味难以纠正，因为它们可能是人们在年幼时就形成了的．

分析 be likely to属于固定短语，由于habits和form之间是被动关系，又因为是在"年幼时就形成了的"，综合这三点，空里的内容应该用不定式的完成时态，即"to have been done"结构．

解答答案：to have been formed

点评考查现在完成时的被动语态．根据时间状语确定时态，由于固定结构"be likely to"，所以用不定式的完成时态．

练习册系列答案

星空初中假期作业寒假乐园新疆青少年出版社系列答案

寒假作业贵州人民出版社系列答案

寒假作业内蒙古大学出版社系列答案

相关题目

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。作文中共有10处语言错误，每句中最多有两处。每处错误涉仅及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；

2.只允许修改10处，多者（从第11处起）不计分。

Dear American guests,

On behalf of our school, I would like to express our warmly welcome to you. We are lucky to have us here in the middle of our English Week activities.

As being planned, we had English Talent Show today. The purpose of this programme is develop our interest in English learning and practical abilities in listening and spoken. The programme consists in the following activities: recitation, singing, word spelling, storytelling and so on. The Show will begin at two o’clock this afternoon at the Student Center. Dear guests, you are welcomed to take part in our activities. I hope we student will benefit greatly from your presence.

I sincerely hope you a pleasant time with us. Thank you.

Did you know that sixty percent of your body weight is water？However，a loss of only two percent of this water through dehydration(脱水) during exercise can significantly affect your performance. The more you sweat，the more your exercise performance declines，unless you drink enough to replace your loss of fluids.

When you lose too much water，you can overheat quite easily，especially in a warm environment. But this is not the only problem you may be faced with. Dehydration leads to your heart pumping much faster，which means exercise becomes more difficult and requires more effort. Despite these problems，however，many of us simply do not take enough fluids in when we head for the gym or set out on a run.

So why is this? How do we manage to lose so much water without simply drinking more to replace it？Well，it is easier than you think. When we are at rest，we quickly become aware that we are thirsty and will put that right by having a drink. When we exercise，on the other hand，our thirst mechanism(结构) does not work as effectively，so we don't notice early enough that we are actually thirsty. In fact，we only start to feel thirsty when we have already lost around two percent of our body weight.

Another problem is that，the more dehydrated we become during exercise，the more difficult it is to prevent further dehydration—because our stomachs become intolerant to fluids and we do not absorb water properly，just when we need it most.

The key thing about fluids and exercise is to manage your intake properly—regular small amounts are better，and some should be drunk before the period of exercise begins. You also need to match your intake to the sort of exercise you are doing. For instance，for one hour of exercise，such as taking part in a 10 km run，you need to drink about two extra liters of water. For longer periods of exercise，sports drinks are recommended.

1.We know from the text that during exercise，dehydration________.

A. can be easily avoided

B. will lead to poor performance

C. can cause many health problems

D. will be controlled whenever we drink again

2.Why do people suffer from dehydration easily during exercise?

A. Their thirst mechanism stops working.

B. Their focus is on the exercise.

C. Their thirst response is slow.

D. Their stomachs are full.

3.When exercising，you are advised to________.

A. have regular breaks