Unit 7 The Sea 开启快乐学习之旅The undersea world is very beautiful. Now more and more people want to dive in the water to find the secrets there. Scuba diving is a new sport today. It can take you into a wonderful undersea world. You will find many strange animals in the sea. Some are as large as a school bus. Many sea animals give out light in the dark and some have sharp teeth. During the day, there is enough light. Here, under the sea, everything is blue and green.When fishes swim nearby, you can catch them with your hands. If you have bottles of air on your back, you can stay in deep water for a long time. However, you can't dive too deep, and you must be very careful when you dive in deep water.The deep sea is not an easy place to live in. It's cold, and it's dark, too. The deeper it is, the less sunlight there is. At about 3,000 feet, there is no light at all. It is very dark in the sea. Many fishes have no eyes. Some have big eyes. A few have eyes on one side.Besides the cold and the darkness, deepsea animals face a third danger—other animals.Animals eat! They must find food to eat. Many animals eat plants. However, some animals eat meat. This means these sea animals have two big jobs. They need to find animals as food, and they have to try not to become other animals' meal.神秘的海底世界吸引了越来越多的人前去探索其中的奥秘，让我们先了解一下吧！Period One Warmup & Lesson 1 The Spirit of ExplorersⅠ.重点单词1．underwater adj. 在水下，供水下用的2．spirit n. 精神3．journey n. 旅行，旅程 4．sailor n. 水手，海员5．voyage n. 航海；航空6．further adv. 更远，较远7．lecture n. 讲授，演讲8．present day adj. 现代的，当今的9．deed n. 行为，行动10．explorer n. 探险家→explore vt. 探险，探索1...
