一、根据句意、中文释义和首字母提示，写出句中所缺单词
1. I need to (贮存) the food in a safe place before I leave.
2. Mike studied hard all year. (因此), he did well in the exam.
3. How many (吨) of food does a man eat in his lifetime on average?
4. W can help to stop floods because they are like natural sponges, taking in and keeping water during heavy rainfall.
5. As we are family, we need to s each other.

1. store 2. Therefore 3. tons 4. Wetlands 5. support

二、根据语篇内容，从方框中选择合适的单词并用其正确形式填空

An ecosystem is like a busy little city. It is a community of (1) things. An ecosystem has many plants and animals. The things around are part of it too. Soil, rocks and water are important in ecosystems. In a healthy ecosystem, all the parts work together. Each of the plants and animals (2) on the others to live. For example, plants provide food and homes for animals, while animals help spread seeds.
Some ecosystems are (3) . A garden is one example. (4) ecosystems can be huge. A whole rainforest is one big ecosystem. Rainforests are home to (5) of species (物种), and they play an important role in balancing the earth’s climate. (6) , many ecosystems are in danger because of pollution and climate change. These problems can harm plants and animals, making it harder for them to (7) .
If we want to keep these ecosystems healthy, we need to take (8) . We must protect the environment so that all living things can live and grow. By (9) together, we can make a big (10) and help protect our planet for the future.

1. living 2. depends 3. small 4. Other 5. millions 6. However 7. survive 8. action 9. working 10. difference

三、根据中文意思完成句子
1. 海洋覆盖了地球表面最大的区域。
The ocean covers .
2. 你知道海洋中的一些植物为在那里生活的动物生产氧气吗？
Do you know that
?
3. 不幸的是，我们正面临一个严重的问题：海洋污染。

4. 我们是时候采取行动保护海洋了。
It's .

1. the largest area of the earth's surface
2. some of the plants in the ocean produce oxygen for the animals living there
3. Sadly, we're facing a serious problem: ocean pollution.
4. time for us to take action and protect the ocean