A 选词填空。（改编自Reading短文）
three heart return slow down balance
Earth's ecosystems help keep our planet healthy and 1. . An ecosys-tem has living things and non-living things. The ocean covers around two 2. of our planet. It spreads across most of the Earth's surface and plays a key role in 3. climate change. When the sun heats the water, it turns into vapour, then falls as rain and 4. to the ocean, forming a nice water cycle. The ocean is like the 5. of the Earth, keeping the temperature stable.
harm store be home to nearly important
Wetlands are of great 6. to the environment even if they make up only 6% of the land area. The plants there get rid of 7. things in the water to keep it clean. They also help prevent floods by slowing the flow of rainwater and 8. extra water.
Forests cover 9. 33% of the land. Trees give us oxygen and support many kinds of animals. They 10. many wild animals. They also keep the whole ecosystem steady.

1. balanced 2. thirds 3. slowing down 4. returns
5. heart 6. importance 7. harmful 8. storing 9. nearly
10. are home to

【分析】
本题为选词填空，解题思路如下：1. 先通读全文，理解短文围绕生态系统（海洋、湿地、森林）的主题大意；2. 分析每个空缺处的句子结构，判断所需词汇的词性（如形容词、名词、动词形式等）；3. 结合语境和给出的词汇，筛选匹配的词，同时根据语法规则调整词形（如名词复数、动词非谓语形式、词性转换等）；4. 将所选词汇代入验证，确保语句通顺、符合逻辑。
【解析】
1. 空1：and连接并列形容词，需与healthy（形容词）对应，选名词balance的形容词形式balanced，构成“keep...healthy and balanced”（保持健康平衡）；
2. 空2：表示分数“三分之二”，two后接序数词third的复数形式thirds；
3. 空3：固定搭配“play a key role in doing sth”（在做某事中起关键作用），结合语境“减缓气候变化”，选短语slow down的动名词形式slowing down；
4. 空4：主语为it（指代水），一般现在时，谓语动词用第三人称单数，选return的第三人称单数形式returns；
5. 空5：like后接名词作宾语，结合语境“海洋像地球的心脏”，选名词heart；
6. 空6：固定结构“be of great + 名词”（非常……），选形容词important的名词形式importance；
7. 空7：修饰名词things需用形容词，选名词harm的形容词形式harmful（有害的）；
8. 空8：and连接并列动名词，与前面slowing（动名词）对应，选动词store的动名词形式storing；
9. 空9：修饰数词33%需用副词，选副词nearly（几乎，差不多）；
10. 空10：固定搭配“be home to”（是……的家园），主语为they（复数），一般现在时，选are home to。
【答案】
1. balanced 2. thirds 3. slowing down 4. returns 5. heart 6. importance 7. harmful 8. storing 9. nearly 10. are home to
【知识点】
词汇运用、词形转换、固定搭配
【点评】
本题围绕生态系统主题考查选词填空，需结合语境、语法规则及词汇变形完成，侧重基础词汇的灵活运用，是英语学习中常见的基础题型。
【难度系数】
0.5

B 语法填空。(改编自 Integration A 短文)
Zhalong Nature Reserve is one of
1. world's most important wetlands.
The reserve 2. (provide) food and places for lots of wild animals, especially some of the rare birds 3. red-crowned
cranes. Around 20% of red-crowned cranes make Zhalong 4. (they) forever home.
Many birds stay in Zhalong all year round, 5. some only have a short stay there.
Most birds are active in the daytime, so it's easy for 6. (visit) to watch them. However, some people want to make the wetlands smaller 7. (have) more space for farms and buildings. This 8. (lead) to less space for wildlife.
9. (luck), the Chinese government has made laws to protect Zhalong, and these laws can prevent all the bad things from 10. (happen) in the reserve.

1. the 2. provides 3. like 4. their 5. while
6. visitors 7. to have 8. will lead 9. Luckily
10. happening

【分析】本题为英语语法填空题，需结合短文语境、语法规则及词汇用法逐个解题。首先通读全文理解扎龙自然保护区的相关内容，再针对每个空格，结合其语法成分、固定搭配、词性变化等确定答案。
【解析】
1. 形容词最高级“most important”前需加定冠词the，故填the。
2. 主语“The reserve”为单数第三人称，一般现在时中谓语动词用第三人称单数形式，故填provides。
3. 此处表举例“像丹顶鹤这样的稀有鸟类”，用介词like，故填like。
4. 修饰名词“home”需用形容词性物主代词，they对应的形容词性物主代词为their，故填their。
5. 前后两句为对比关系，用连词while，故填while。
6. 此处表示“游客”，visitor为可数名词，需用复数形式，故填visitors。
7. 此处表目的，用不定式to have，故填to have。
8. 前文提到人们想缩小湿地，该行为“将会导致”更少空间，用一般将来时，故填will lead。
9. 修饰整个句子需用副词，luck对应的副词为Luckily，故填Luckily。
10. 固定搭配“prevent...from doing sth”，故填happening。
【答案】1. the 2. provides 3. like 4. their 5. while 6. visitors 7. to have 8. will lead 9. Luckily 10. happening
【知识点】冠词的用法；动词的时态与非谓语动词；词性转换
【点评】本题为英语基础语法填空题，围绕短文语境考查核心语法知识点，题型常规，侧重基础语法的实际运用，适合巩固初中英语语法基础。
【难度系数】0.6

C 根据首字母提示补全短文。（改编自Integration D2 短文）
The ocean is the 1. n home to sea creatures. It offers rich food resources to humans and gives us space for 2. f and adventure. But 3. s, many people still don't realize how important it is to our planet. They did a lot to 4. p the ocean.
Millions of tons of plastic waste float in the water, and 5. h chemicals from factories flow into the sea, harming or even 6. k sea life.
We can all take small steps to 7. s the problems. We should never leave rubbish on beaches and choose environment-friendly 8. p. Education and 9. k are useful tools to help keep oceans clean. Joining an environmental group to work as a volunteer can make a big 10. d. Let's stand together to protect our blue planet.

1. natural 2. fun 3. sadly 4. pollute 5. harmful
6. killing 7. solve 8. products 9. knowledge
10. difference

【分析】
先通读短文，明确主题为海洋保护相关内容；再逐句分析每个空格的词性、所需词义，结合首字母提示推导答案：1. 修饰名词home需形容词，结合语境“海洋是海洋生物的______家园”，首字母n对应natural；2. 与adventure并列需名词，首字母f对应fun；3. 前后句为转折逻辑，需副词，首字母s对应sadly；4. 后文提及破坏海洋的行为，需动词原形，首字母p对应pollute；5. 修饰chemicals需形容词，结合“有害化学物质”，首字母h对应harmful；6. 与harming并列需动名词，首字母k对应killing；7. 与problems搭配需动词，首字母s对应solve；8. 结合“环保产品”需名词复数，首字母p对应products；9. 与education并列需名词，首字母k对应knowledge；10. 固定搭配make a difference，首字母d对应difference。
【解析】
1. 句意：海洋是海洋生物的自然家园，用形容词natural修饰名词home，符合首字母n；2. 由and连接，与adventure并列，需名词fun，符合首字母f；3. 前文强调海洋重要，后文转折说明人们未意识到，用副词sadly，符合首字母s；4. 后文提到塑料垃圾等破坏海洋的行为，需动词pollute（污染），符合首字母p；5. 修饰chemicals需形容词harmful（有害的），符合首字母h；6. 由or连接，与harming并列，需动名词killing（杀死），符合首字母k；7. 与problems搭配，需动词solve（解决），符合首字母s；8. 结合“环保产品”，需名词复数products，符合首字母p；9. 与education并列，需名词knowledge（知识），符合首字母k；10. 固定搭配make a difference（有影响），符合首字母d。
【答案】1. natural 2. fun 3. sadly 4. pollute 5. harmful 6. killing 7. solve 8. products 9. knowledge 10. difference
【知识点】根据首字母提示补全单词；词汇词性运用；固定搭配
【点评】本题考查学生的语境理解能力与基础词汇运用能力，需结合上下文逻辑、词性及首字母提示推导答案，整体难度适中。
【难度系数】0.6