三区视频,爱福利视频,午夜视频网

精英家教網 > 高中英語 > 題目詳情

It is difficult for us to learn a lesson in life_________we’ve actually had that lesson.

A. until B. after C. since D. when

練習冊系列答案

年級	高中課程	年級	初中課程
高一	高一免費課程推薦！	初一	初一免費課程推薦！
高二	高二免費課程推薦！	初二	初二免費課程推薦！
高三	高三免費課程推薦！	初三	初三免費課程推薦！
更多初中、高中輔導課程推薦,點擊進入>>

相關習題

科目：高中英語 來源： 題型：

第二卷 ( 共三部分，滿分35 )

第四部分單詞拼寫 (共10小題；每小題1分，滿分10分)

71. The scientist o__________ the mice carefully after they were given the drug.

72. Many volcanoes have been dead for not having e__________during the past several hundred years.

73. The medical team c_________ of twenty doctors and nurses received a warm welcome in that country.

74. A red sky at night i_________ fine weather the following day.

75. Prices are different d_________ on the area you choose.

76. Unemployment is one of the major problems of __________(現代的) times.

77. Walking in the open air, I felt the wind __________(輕拂著) against my face.

78. We should develop our students’ ability of __________(結合) theory with practice.

79. Parents’ words and deeds have a great impact on the _______(形成) of children’s character.

80. The area is being _________(推廣) as a tourist destination.

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

The twentieth century saw greater changes than any century before : changes for the better , changes for the worse ; changes that brought a lot of benefits to human beings , changes that put man in danger . Many things caused the changes , but , in my opinion , the most important was the progress in science .

Scientific research in physics and biology has vastly broadened our views . It has given us a deeper knowledge of the structure of matter and of the universe ; it has brought us a better understanding of the nature of life and of its continuous development . Technology in the application of science has made big advances that have benefited us in nearly every part of life .

The continuation of such activitites in the twenty-first century will result in even greater advantages to human beings : in pure science―a wider and deeper knowledge in all fields of learning ; in applied science―a more reasonable sharing of material benefits , and better protection of the environment .

Sadly , however , there is another side to the picture . The creativity of science has been employed in doing damage to mankind . The application of science and technology to the development and production of weapons of mass destruction has created a real danger to the continued existence of the human race on this planet . We have seen this happen in the case of nuclear weapons . Although their actual use has so far occurred only in the Second World War , the number of nuclear weapons that were produced and made ready for use was so large that if the weapons had actually been used , the result could have been the ruin of the human race , as well as of many kinds of animals .

William Shakespeare said , “ The web of our life is of a mingled yarn(紗線), good and ill together .” The above brief review of the application of only one part of human activities—science seems to prove what Shakespeare said . But does it have to be so ? Must the ill always go together with the good ? Are we biologically programmed for war ?

1. Which of the following best shows the stucture of the passage ?

（①=Paragraph1 , ②= Paragraph 2，③= Paragraph 3，④= Paragraph 4，⑤= Paragraph 5）

2. From the fourth paragraph , we can infer that __________.

A. a great many nuclear weapons were actually used for war

B. a large number of nuclear weapons should have been used for war

C. the author is doubtful about the ruin of human beings by nuclear weapons

D. the author is anxious about the huge number of unclear weapons on the earth

3. The underlined word “ mingled ” in the last paragraph most probably means__________.

A. simple B. mixed C. sad D. happy

4. What do you think the author is most likely to suggest if he continues to write ?

A. Further application of science to war .

B. More reading of William Shakespeare .

C. Proper use of science in the new century .

D. Effective ways to separate the good from the ill .

查看答案和解析>>

科目：高中英語 來源： 題型：閱讀理解

Farmers use different kinds of soil conservation methods to protect their land from damage by farming and the forces of nature . One important form of soil conservation is the use of windbreaks . Windbreaks are barriers formed by trees and other plants with many leaves . Farmers plant them in lines around their fields .

Windbreaks stop the wind from blowing soil away . They also keep the wind from destroying or damaging crops . They are very important for growing grains , such as wheat . There have been studies done on windbreaks in parts of West Africa , for example . These found that grain harvests can be twenty percent higher in fields protected by windbreaks compared to fields without such protection .

However , windbreaks seem to work best when they allow a little wind to pass through . If the wall of trees and plants stops wind completely , then violent air motions will take place close to the ground . These motions will lift soil into the air where it will be blown away .

For this reason , a windbreaks is best if it has only sixty to eighty percent of the trees and plants needed to make a solid line . An easy role to remember is that windbreaks can protect areas up to ten times the height of the tallest trees in the windbreaks .

These should be at least two lines in each windbreak . One line should be large trees . The second line , right next to it , can be shorter trees and other plants with leaves . Locally grown trees and plants are best for windbreaks .

1.What is the best title for the passage?

A.Building a windbreak to protect soil	B.Building a windbreak to protect crops
C.Using a windbreak to improve grains	D.Using a windbreak to improve plants

2.In the fifth paragraph the author tells us windbreaks______.