答案在下一页One Good Reason to Let Smallpox LiveIt's now a fair bet that we will never see the total extinction of the smallpox virus.The idea was to cap t...2015-09-29
动词不定式可以在句子中用作状语,有下列几种情况:[A] 放在不及物动词(come,go,stop,finish,wait等词)的后面。如:He came to see her yesterday.(他昨天来看望她)(表示来的目的)/ I stopped to have a rest.(我停下来休息一...2015-09-29
come/go into effect生效,实施catch one eye引人注目make a face做鬼脸catch fire着火make friends交朋友,友好相处make fun of取笑,嘲弄lose heart丧失勇气,失去信心get hold of抓住,掌握throw/cast l...2015-09-29
Lead PollutionLead deposits, which accumulated in soil and snow during the 1960’s and 70’s, were primarily the result of leaded gasoline emissions ori...2015-09-29
Britain’s Solo SailorEllen MacArthur started sailing when she was eight,going out on sailing trips with her aunt.She loved it so much that she saved h...2015-09-29
Eiffel Is an EyefulSome 300 meters up,near the Eiffel Tower's wind-whipped summit the world comes to scribble.Japanese,Brazilians.Americans-they graf...2015-09-29
Can Buildings Be Designed to Resist Terrorist Attack?In the aftermath of the terrorist attack on the World Trade Center, structural engineers are try...2015-09-29
Better Control of TB Seen If a Faster Cure Is FoundThe World Health Organization1 estimates that about one-third of all people are infected with bacte...2015-09-29
Operation MigrationIf you look up at the sky in the early fall in the northern part of North America, you may see groups of birds. These birds are fly...2015-09-29
From Ponzi to MadofThe year was 1920. The country was the United States of America. The man's name was Charles Ponzi. Ponzi told people to stop depos...2015-09-29
The Effects of Global Warming on WeatherThere are hidden factors which scientists call "feedback mechanisms”。 No one knows quite how they will interac...2015-09-29
Physical FitnessPhysical fitness is today’s hot topic. And wherever you turn, you hear something new. But is it all true?The more you sweat, the more ...2015-09-29
代词(一)代词的分类:英语中代词分为:人称代词、物主代词、反身代词、指示代词、关系代词、疑问代词、连接代词和不定代词等等。(二)人称代词:人称代词代替人和事物的名称,分为主格和宾格两种形式。1.主格用来作句子的主语、表语。如: I often go shopping on Sundays.(星期天我...2015-09-29
Most Adults in US Have Low Risk of Heart DiseaseMore than 80 percent of US adults have a less than 10–percent risk of developing heart disease in the ...2015-09-29
add up to合计,总计break away(from)脱离,逃跑come true实现,达到come up with提出,提供do away with废除,去掉have nothing to do with和…毫无关系make believe假装catch up with追上,赶上come u...2015-09-29
go before居前have to/have got t0不得不,必须help oneself自取所需(食物)keep out of躲开,置身…之外get out of逃避,改掉have get有give oneself up自首,投降,投案go along with陪同前往,随行g0 in fo...2015-09-29
Gross National HappinessIn the last century, new technology improved the lives of many people in many countries. However, one country resisted these c...2015-09-29