一、根据课文内容及首字母提示完成下列短文
The Earth's three major ecosystems: oceans, wetlands, and forests, play important roles in maintaining the (1) of our planet.
The ocean, covering around 71% of the Earth's surface, is like the (2) of our planet. It is a vast ecosystem that produces about 70% of the Earth's oxygen and is (3) to countless species. Water from the ocean evaporates, (4) on land, and then returns to the ocean, forming an endless cycle.
Wetlands, which (5) about 6% of the Earth's land area, are nature's "kidneys." They can (6) water during heavy rains, prevent floods, and help purify water by removing pollutants. They also (7) habitats for about 40% of the world's plants and animals.
Forests, making up nearly a (8) of the Earth's land area, are often called the "lungs" of the Earth. They take in carbon dioxide and produce oxygen, while also trapping (9) in the air. These three ecosystems support millions of plants and animals, keeping our (10) healthy and vibrant.

1.balance 2.heart 3.home 4.falls 5.cover 6.store 7.provide 8.third 9.pollutants 10.planet

1. 根据首字母"b"及"maintaining the...of our planet"可知，此处指维持地球的平衡，填balance。
2. 由"the...of our planet"及海洋的重要性，结合首字母"h"，填heart。
3. "be home to"为固定搭配，意为"是……的家园"，填home。
4. 水蒸发后在陆地上形成降水，"fall"符合语境，主语为不可数名词，用第三人称单数形式falls。
5. 湿地"覆盖"地球陆地面积的6%，"cover"符合，主语为复数，用原形cover。
6. 湿地在大雨时能"储存"水，"store"符合，情态动词后用原形store。
7. 湿地为动植物"提供"栖息地，"provide"符合，主语为复数，用原形provide。
8. "a third"表示"三分之一"，森林占地球陆地面积近三分之一，填third。
9. 森林能捕获空气中的"污染物"，"pollutants"符合语境，用复数pollutants。
10. 这些生态系统保持我们的"星球"健康，填planet。

二、微写作 Why are wetlands so important to the earth? (At least 5-8 sentences)

Wetlands are important to the earth for many reasons. They can store water and prevent floods. They also help clean the water by filtering dirt and pollutants. Many animals and plants live in wetlands, so they are important habitats. Wetlands can also control climate by absorbing carbon dioxide. Additionally, they provide food and resources for people. Protecting wetlands is necessary for our planet's health.

( ) 1.
( ) 2.
( ) 3.
( ) 4.
( ) 5.
( ) 6.
( ) 7.
( ) 8.
( ) 9.
( ) 10.

A A C B C A B C B A

1. A项，根据语境，高大的树木像强壮的“卫士”，guards（卫士）符合语境；B项walls（墙）、C项mountains（山）、D项towers（塔）均不符合，故选项A正确。
2. A项，根据后文“它们吸收二氧化碳，释放我们呼吸所需的氧气”可知，这些植物“净化”空气，clean（净化）符合语境；B项pollute（污染）、C项change（改变）、D项heat（加热）均不符合，故选项A正确。
3. A项，松鼠在树枝间“跳跃”收集坚果，jump（跳跃）符合语境；B项dance（跳舞）、C项run（跑）、D项walk（走）均不符合，故选项C正确。
4. A项，鸟儿在树上筑巢，每天早上“悦耳地”唱歌，sweetly（悦耳地）符合语境；B项sadly（悲伤地）、C项loudly（大声地）、D项angrily（生气地）均不符合，故选项B正确。
5. A项，根据后文人们砍伐树木可知，森林处于“危险”中，in danger（处于危险中）是固定搭配，故选项C正确。
6. A项，人们砍伐树木是为了“木材”，wood（木材）符合语境；B项furniture（家具）、C项houses（房子）、D项desks（书桌）均是木材加工后的产品，不符合语境，故选项A正确。
7. A项，so...that...（如此……以至于……）是固定搭配，符合语境；very、too、quite均无此用法，故选项B正确。
8. A项，根据语境，我们必须采取“行动”保护它们，take actions（采取行动）是固定搭配，故选项C正确。
9. A项，根据语境，一种方法是“种”更多的树，plant（种植）符合语境；A项cut（砍）、C项draw（画）、D项paint（涂画）均不符合，故选项B正确。
10. A项，根据语境，它们“维持”自然的平衡，keep（维持）符合语境；B项break（打破）、C项lose（失去）、D项destroy（破坏）均不符合，故选项A正确。