五、语法填空
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
体裁：说明文 主题：人与动物 难度：★★★★★ 建议用时：8 min 正确率：/10
新素材·“鸟浪”奇观 A wonderful “bird wave” at the Yellow River Delta in Dongying, Shandong, became very popular online.
In late 2025, over 240,000 Baikal teals(花脸鸭) got together in the sky. When people looked up at that time, they 1 (fly) together in a huge, shape-changing group. The bird group sometimes looked like a big whale, and sometimes like a huge bird. Against the sunset, the scene was so 2 (value) that people called it a living picture of the “Kunpeng” from Zhuangzi’s tale. These teals seemed to form the “bird wave” to show 3 (they) to people under the sunset.
What we see 4 the “bird wave” is actually a survival skill of birds, not magic. They form such large groups for two key purposes. One is to save energy during long trips, and the other is for their 5 (safe) against enemies. Flying together in a certain way helps them catch the wind 6 (easy) than flying alone.
Many people wonder 7 the Yellow River Delta Wetland is so welcoming to birds. The real reason is the healthy environment. 8 it was once a poor area with few plants and birds, through years of hard work like providing water and returning farmland to wetland, it has now turned into an important resting place for birds. The number of bird species there 9 (increase) greatly over the years. Local tourism offices have made guidelines for bird watching. Visitors are required to keep at least 100 metres away, not to use drones(无人机) to get close to the birds, and never 10 (feed) them. We should enjoy this gift from nature while also protecting it.
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【语篇解读】本文是一篇说明文。文章主要介绍了山东东营黄河三角洲湿地的“鸟浪”奇观。
1. were flying 句意：当人们抬头看时，它们正成群结队地一起飞，队伍形状不断变化。根据“On the evening of December 7，2025”和“When people looked up at that time”可知此处描述的是当时花脸鸭正在进行的动作，时态应用过去进行时。故填were flying。
2. valuable 句意：在夕阳的映衬下，这一幕如此珍贵，人们称之为庄子故事中“鲲鹏”的生动画面。根据“the scene was so”可知此处应用形容词作表语。故填valuable。
3. themselves 句意：这些花脸鸭似乎组成了“鸟浪”，在夕阳下向人们展示自己。此处应用反身代词表示“它们自己”。故填themselves。
4. as 句意：我们所看到的“鸟浪”实际上是鸟类的一种生存技能，而不是魔法。see as表示“把……看作”。故填as。
5. safety 句意：一个是为了在长途旅程中节省能量，另一个是为了防御敌人保证安全。根据“for their”可知此处应用名词作宾语。故填safety。
6. more easily 句意：以某种方式一起飞行比独自飞行更有助于它们轻松地抓住风力。根据“than flying alone”可知此处应用比较级，修饰动词“catch”，应用副词的比较级。故填more easily。
7. why 句意：许多人想知道为什么黄河三角洲湿地如此受鸟类欢迎。根据“The real reason is the healthy environment.”可知此处指想知道原因，用why引导宾语从句。故填why。
8. Though/Although 句意：虽然它曾经是一个植物和鸟类稀少的贫瘠地区，但经过多年的努力，如供水和退耕还湿，它现在已经成为鸟类的重要栖息地。上下文是让步关系，句首首字母需大写。故填Though/Although。
9. has increased 句意：多年来，那里的鸟类物种数量大幅增加。根据“over the years”可知此处时态应用现在完成时。故填has increased。
10. to feed 句意：游客被要求保持至少100米的距离，不要使用无人机接近鸟类，永远不要喂它们。be required never to do sth.表示“被要求不要做某事”。故填to feed。