When was the first Earth Day celebated?

相关推荐

• 英语翻译Time is flying away,First the hour and then the day;Next the week,the month,the year,Go away and disappear.Time is away on the wing,When i speak,or think,or sing.Time is flying fast away,Never waste time,let us say.
• 阅读理解The journey to the moon has been the first step towards future exploration（探险）space.The journey to the moon has been the first step towards future exploration（探险）space. The distance between the moon and the earth is very short indeed when compared the distances between earth and the other planets. Mars, the nearest planet to Earth is millions of miles away! Traveling to the planets will be man's next aim. Such travels will be more challenging(挑战)
• HELP~~翻译,急~~As a result,because of that one mistake by your teacher,it is possible your whole life you would be denied the beauty of fractions,but on your first day no teacher would be so foolish,He would start you with elementary things - then,when you had acquired skill with the simplest problems,he would laed you up to fractions
• Thanksgiving Day is on the fourth Thursday in November,But when did the festival_1_?About 400 years ago, the first group
• the poor children will never forget the day when they first ——————（to go）to beijing
• Helen is my old friend.We____thirty years ago when we werefive 2 old.It was my first day.
• 那这个呢；When our part of the earth turns away from the sun,it is day
• it was on the day when we had our english evening last week that we first me
• Where has all the time gone?I can still remember the day when I first came to this school,
• ★★★when与where,which与when,填空+解释★★★填空1.I'll never forget the day ___ I first went to school.2.I'll never forget the day____we spent in Beijing.3.Is this factory___we visitedlast week?4.This is office ___Lincoln once worked in.选择They're in the places____couldn't be found.a.that b.where c.in which d.in that请顺便为我讲解一下when与where,which与when在这类句子中有什么不同,为什么要那么选?
• 以二苯胺磺酸钠为指示剂,用重铬酸钾标定亚铁离子时,为什么由红紫色变成墨绿色,还不是变成无色?
• 图是2012年6月的月历,认真观察阴影部分五个数的关系.根据你发现的规律想一想：像这种形式哪5个数的和是