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 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 fish swim nearby, you can catch them with your hands. When 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, deep-sea 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 jobs. They need to find animals as food, and they have to try not to become other animals' meal.

举 例说明，日本侵略中国的犯罪史实。

依次填入下面各句横线上的词语正确的一项是（  ）

①近日，公安部门借助高科技手段侦破了一起网络诈骗案，在铁证面前犯罪分子不得不认罪        。

②深更半夜还有一个人在校园徘徊，小刘发现这个人       可疑，便悄悄盯上了。

③连日暴雨使重庆北部山区山洪_________，致使公路被毁，交通中断。

④我本来可以站起来，但是           我站起身来瞧瞧它，十之八九我也说不出它到底是什么；        一旦一件事发生以后，就没有人能知道它是怎么发生的了。