五、语法填空。
A
Natural wonders are amazing gifts from nature. They are 21. (real) wonderful and worth protecting. They offer 22. (we) beautiful sights and teach us about nature's power. They also play an important role in 23. (keep) the ecosystem balanced. The Grand Canyon is 24. famous natural wonder in the US. It is one of 25. (great) natural wonders in the world. Located in Arizona, it draws millions of 26. (visit) each year. Scientists once studied 27. the Colorado River created such a huge canyon. Then they found that the canyon 28. (form) by the river over millions of years. Many tourists who visit it 29. (realise) how amazing these wonders are so far. However, pollution, climate change and too many visitors are putting them 30. risk. We must take action to protect these precious gifts of nature.

21.really 22.us 23.keeping 24.a
25.the greatest 26.visitors 27.how
28.was formed 29.have realised 30.at

【分析】
本题为语法填空题，需结合词性、固定搭配、时态语态、冠词等语法知识逐一分析每个空：
1. 21空：修饰形容词wonderful，需用real的副词形式；
2. 22空：动词offer后接人称代词宾格作宾语；
3. 23空：固定搭配中介词后需接动名词；
4. 24空：泛指单数可数名词需用不定冠词；
5. 25空：one of结构后需用形容词最高级，且最高级前加定冠词；
6. 26空：millions of后需接可数名词复数；
7. 27空：根据句意需用疑问词引导宾语从句表方式；
8. 28空：主语与动词是被动关系，且动作发生在过去，需用一般过去时被动语态；
9. 29空：时间状语so far提示用现在完成时；
10. 30空：需用固定搭配中的介词。
【解析】
21. 空格修饰形容词wonderful，需用real的副词形式really，故填really；
22. 动词offer后接人称代词宾格，we的宾格为us，故填us；
23. 固定搭配play a role in doing sth中，介词in后接动名词，keep的动名词为keeping，故填keeping；
24. 此处泛指“一个著名的自然奇观”，用不定冠词a，故填a；
25. one of + the + 形容词最高级 + 名词复数结构中，great的最高级为greatest，前加定冠词the，故填the greatest；
26. millions of后接可数名词复数，visit对应的名词visitor的复数为visitors，故填visitors；
27. 从句意“科罗拉多河如何形成大峡谷”可知，用how表方式，故填how；
28. 主语canyon与form是被动关系，动作发生在过去，用一般过去时被动语态was formed，故填was formed；
29. 时间状语so far提示用现在完成时，主语为复数，故用have realised，填have realised；
30. 固定搭配put sth at risk中用介词at，故填at。
【答案】
21.really 22.us 23.keeping 24.a 25.the greatest 26.visitors 27.how 28.was formed 29.have realised 30.at
【知识点】
词性转换、固定搭配、时态语态
【点评】
本题考查初中英语核心基础语法，涵盖词性变化、冠词、形容词最高级、时态语态及固定搭配等知识点，注重基础应用，难度适中，适合巩固语法基础。
【难度系数】
0.6

B
How much do you know about sharks? They actually stand at the top of the ocean ecosystem and are considered 31. (strong) creatures in the ocean food chain. However, many have heard of shark fin soup, which means killing a whole shark each time someone enjoys 32. bowl of it.
When people catch sharks, they cut off their fins and throw 33. (they) back into the ocean. This is not only cruel, but also harmful 34. the environment. Without a fin, a shark can no longer swim 35. (free) in the sea. As a result, it 36. (die) slowly day by day.
Now millions of sharks 37. (catch) for making shark fin soup every year. People call on governments 38. (make) strict laws to protect sharks. They also refuse to buy 39. (product) made of them. Scientists have also explained 40. shark fins have no special health value. Anyway, it's time to save the sharks!

31.the strongest 32.a 33.them 34.to
35.freely 36.will die 37.are caught 38.to make
39.products 40.that/不填

【分析】本题为英语语法填空题，需先通读全文把握主旨（保护鲨鱼），再针对每个空格，结合句子结构、语境、固定搭配及语法规则（如词性转换、时态、语态、从句引导词等）逐一分析，确定每个空的正确形式。
【解析】
31. 由范围“in the ocean food chain”可知，此处需用形容词最高级，strong的最高级为the strongest，故填the strongest。
32. “a bowl of”是固定搭配，意为“一碗……”，此处表示“一碗鱼翅汤”，故填a。
33. 动词“throw”后需接人称代词宾格，they的宾格为them，指代前文的sharks，故填them。
34. “be harmful to”是固定搭配，意为“对……有害”，故填to。
35. 此处修饰动词“swim”，需用副词，free的副词形式为freely，故填freely。
36. 此处表示将来会发生的动作，需用一般将来时，故填will die。
37. 主语“sharks”与动词“catch”是被动关系，且由“every year”可知用一般现在时的被动语态，主语为复数，故填are caught。
38. “call on sb to do sth”是固定搭配，意为“号召某人做某事”，故填to make。
39. product是可数名词，此处表示泛指的“鲨鱼制品”，需用复数形式，故填products。
40. 此处为宾语从句，从句是陈述句，引导词that可省略，故填that/不填。
【答案】31.the strongest 32.a 33.them 34.to 35.freely 36.will die 37.are caught 38.to make 39.products 40.that/不填
【知识点】形容词最高级、时态语态、固定搭配
【点评】本题围绕保护鲨鱼的话题，考查初中英语核心基础语法知识，侧重语法规则与固定搭配的应用，难度适中，适合初中阶段学生练习。
【难度系数】0.6