Some scientists estimate that 'life' began on our planet as early as four billion years ago. And the first living things weresimple, single-celled, micro-organisms called prokaryotes(they lacked a cell membrane and a cell nucleus). How did microorganisms come into existence?
&v.进步1 In the 1960s and 1970s, the greatest fear was that the human race, and在20世纪60年代和advancement n.前进,进步that引导表语从句20世纪70年代,人类可advance payment 预付款possibly al advanced① life forms on the planet could be wiped③ out能还有地球上所有高级的②wipe/waIp/v.擦,拭...
hearthealth,orothersidesofpeople?lifestyle.” Thestudyfollowednearly120,000peoplefor30years.Themoreregularlypeopleatenuts,theless likelytheyweretodieduringthestudy.Peopleeatingnutsonceaweekwere11%lesslikelytohavedied duringthestudythanthosewhoneveratenuts.LeadresearcherDr.CharlesFuchs,fromtheDanaFarberCancerInst...
When did Neptune become a planet? What year was Mercury the planet discovered? What is Mars made of? When was the constellation Leo discovered? When was Ceres classified as a dwarf planet? When was the Cancer constellation discovered? When did humans first appear on Earth? How was the planet...
isapictureofDorothy Woodruff,onherhorse, lookingdownfrom ahilltop:“Whenthesun slippedbehindthemountains,itshedarosyglow allaroundthem.Thenafull moonrose.The snow wasmarkedonlybysmallanimals:foxes, coyotes,mice,andvaryinghares,whichturned whiteinthewinter.” 4.WhydidDorothyandRosamondgototheRocky Mountains...
“If Earth can support life why can’t other planets do the same too? Astronomers have already discovered a Jupiter(木星)- like planet orbiting a Sun-like star so why not an Earth-like planet orbiting a Sun-like star?To achieve this goal though many other problems have to be taken into...
Sure, these gifts aren’t the sexiest items, but they all serve a purpose (and serve it well), and your loved one is guaranteed to get great mileage out of them. Whether it’s an item to make daily life easier, a smartly designed travel accessory, or a beauty product they’ll use ...
On screens usually appears a dragon. It’s a symbol of light, growth and life-giving water. It also stands for nobility and power. The peacock, a beautiful bird, can be seen on screens, too. It’s a symbol of everlasting life. Beautiful flowers, which mean wealth and good luck, are...
A.It helped him to finish his study at the university. B.It allowed him to change his mind about his future. C.It gave him ideas about the beginnings of human life. D.It got him to complete his most famous book on the ship.3. In what order did the following happen in Darwin’s...
6.What is the main reason why the woman loves Taylor Swift? A.Taylor’s songs. B.Taylor’s hometown. C.Taylor’s appearance. 7.Where did the woman first see Taylor Swift? A.In the news. B.On the Interne...