1、Unit 3 Under the sea.七选五The Sea Is the Place to Be Walking around is fine，but have you ever been eager to be able to move in any direction you want？Why not have beautiful creatures of many colors moving gracefully around you while youre exploring？ 1 Scuba diving(水肺潜水) is a way of swimming underwater
2、 without having to come for air every minute or so.Scuba divers wear scuba equipment, the most important of which is the oxygen tank or some other air source. 2 Also important is the diving mask，which allows divers to clearly see fish, plants，rocks, sunken ships, or whatever else is around.Most dive
3、rs also wear flippers similar in shape to webbed feet that help them swim easily. 3 After getting the equipment, the diver is ready to dive，right? Not quite. 4 Most of the risks can easily be avoided if the diver knows how to be careful.If not, serious accidents can occur.If theres a problem with th
4、e air tank, the diver could end up stuck too far underwater to be able to get up in time to breathe.Also, divers have to avoid going down too far and too quickly. 5 Once youve had some training though，youre ready to take a dive and explore a whole new world under the sea.AIf not, they can suffer ser
5、ious damage to the body.BDiving is dangerous and it requires training.CWith an oxygen tank，divers can stay underwater for a long time.DIf you live far from the ocean, you can find lakes and large rivers.EAnd if the water is cold, speciallydesigned suits can keep a diver warm.FScuba diving has become
6、 one of the greatest sports all around the world.GIf this sounds appealing to you, start saving money to learn how to scuba dive.本文是说明文。文章主要介绍了水肺潜水的相关注意事项。1G解析：第二段第一句提到，水肺潜水是一种在水底的游泳方式，由此可见，空格处引出了水肺潜水的话题，G项“如果这个主意听起来很吸引人，那么开始存钱学水肺潜水吧”符合语境。2C解析：此处介绍的是潜水装备，其中最重要的是氧气瓶或其他的供氧器具，接下来应该介绍的是这些供氧器具的作用，C项“有了氧气
7、瓶，潜水员就可以在水底待上很长一段时间”符合语境。3E解析：此处接着介绍潜水装备，E项中提到的潜水衣也是潜水装备之一，符合语境。4B解析：空格后提到，如果潜水员知道如何小心防范，就可以轻易避免大多数的危险。由此可见，空格处提到了潜水的危险性，B项“潜水有危险性，所以潜水员需要经过训练”符合语境。5A解析：空格前面一句提到，潜水员也必须避免以过快的速度潜入过深的海底，接下来应该解释为什么要这么做，A项“如果不这么做的话可能会对身体造成严重的伤害”符合语境。.翻译下列句子，注意黑体部分要用到本单元的单词、短语或句型，然后将其合并成一篇短文1在生活中我们经常目睹一些感人的画面。We often wi
8、tness some moving scenes in life.2当有人处于困境的时候，很多人伸出援助之手。When someone is in trouble, many people help them out.3很多人遇到一些可怕的事情时几乎吓得要死。When they meet with some frightening things, many people are almost scared to death.4去帮助那些需要帮助的人是需要勇气的。It takes courage to help those who are in need of help.5我们认识到这个世界需要
9、每个人的善良。We are aware that the world needs everyones kindness.请将以上句子连成一篇语言流畅、用词准确、逻辑严密的短文。We often witness some moving scenes in life.When someone is in trouble, many people help them out.Help is needed because when they meet with some frightening things, many people are almost scared to death.Of course, it takes courage to help those who are in need of help.After all, we are aware that the world needs everyones kindness.