第四册：流利英语 · 单元 4 复习与自测

单元导读 · 单元语法总结 · 单元单词与短语 · 单元复习与自测

先独立作答，再展开答案。下列原创题从相应课时选取，覆盖本范围每一课；错题请回到课时讲解解释错误原因，再替换一个条件重做。

Lesson 25 · 名词化与施事信息

阅读材料（本站原创）： A reduction in background noise coincided with fewer interruptions during the task.

练习 1

填空：exposure ___ background noise。

参考答案与解析

答案： to

解析： exposure to 为常见搭配。

表达迁移： 写三句虚构办公观察，记录噪声变化、任务表现和一个替代解释。

表达参考与点评

A reduction in corridor noise coincided with fewer interruptions. Staff completed the sorting task more quickly. A change in the task instructions may also have contributed.

名词化方便总结，但最后一句保留其他解释，避免过度推断。

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Lesson 26 · 完成式分词状语

阅读材料（本站原创）： Having compared the layers, the researchers proposed a tentative sequence of events.

练习 1

示例中比较与提出哪个在先？

参考答案与解析

答案： 比较在先。

解析： having compared 标记先完成的动作。

表达迁移： 用三句汇报虚构岩层比较，包含前置完成动作、初步结论和保存局限。

表达参考与点评

Having compared the samples, we placed layer B below layer A in our working sequence. This interpretation remains provisional. Some evidence may have been lost through erosion.

完成式交代研究顺序，后两句说明暂定性和证据缺失来源。

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Lesson 27 · 第三条件句与过去反事实

阅读材料（本站原创）： If the model had been tested earlier, the designers might have noticed the imbalance.

练习 1

示例是否声称模型确实更早接受测试？

参考答案与解析

答案： 没有。

解析： 它构造过去反事实条件。

表达迁移： 写三句虚构船模事故复盘：事实、反事实假设、今天的改进。

表达参考与点评

The model tilted during its first public demonstration. If we had tested it with a full load, we might have detected the imbalance. Future checks should include several loading conditions.

事实与假设不混写，末句将反思转成明确可测试的改进。

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Lesson 28 · 间接问句与疑问语序

阅读材料（本站原创）： Could you explain what this term means in plain language?

练习 1

把 When does the appointment begin? 放入 Could you tell me…?

参考答案与解析

答案： Could you tell me when the appointment begins?

解析： 间接问句使用陈述语序，begins 随单数主语。

表达迁移： 写三句就诊沟通练习，仅询问信息表达：术语含义、理解核对、书面说明。

表达参考与点评

Could you explain what this term means? I want to make sure I have understood your explanation correctly. Would it be possible to have the main points in writing?

问题集中在沟通与理解，使用礼貌框架，不替专业人员提供诊疗结论。

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Lesson 29 · 使役与许可结构

阅读材料（本站原创）： The air cushion allows the model to move across the smooth floor.

练习 1

填空：The guide enabled visitors ___ understand the diagram.

参考答案与解析

答案： to

解析： enable + 宾语 + to do。

表达迁移： 用三句向中学生解释一个纸模型，说明条件、动作和演示边界。

表达参考与点评

A thin layer of air allows the model to slide over the table. A small fan provides the airflow. This demonstration illustrates one principle rather than the full design of a real craft.

功能结构清晰，最后一句说明模型只展示部分原理，避免过度类比。

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Lesson 30 · 介词 + which 的关系从句

阅读材料（本站原创）： The pressure under which the sensor operates must be recorded.

练习 1

填空：the depth ___ which the camera was tested。

参考答案与解析

答案： at

解析： 在某深度使用 at a depth。

表达迁移： 用三句介绍一张虚构海底图：测量条件、图像所示、尚未确定的细节。

表达参考与点评

The report lists the depth at which each image was taken. A ridge appears along the eastern edge. Smaller features remain uncertain because the resolution is limited.

条件、图形观察和分辨率限制分开表达，不把图像当作无误的直接观看。

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Lesson 31 · 独立主格的主语与分词

阅读材料（本站原创）： The clay still damp, the sculptor covered the model before leaving.

练习 1

示例背景结构的逻辑主语是什么？

参考答案与解析

答案： the clay

解析： damp 描述 clay，而不是 sculptor。

表达迁移： 写三句工作室观察：材料状态、创作者动作、你对形式的个人感受。

表达参考与点评

The surface still rough, the artist examined the model from the side. She removed a small piece near the base. To me, the new shape seemed lighter and more balanced.

独立主格提供材料背景，末句 To me 将观众感受与作者意图区分。

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Lesson 32 · 形容词前置的 as 让步结构

阅读材料（本站原创）： Limited as the evidence is, it gives us a reason to repeat the experiment.

练习 1

用 although 改写 Limited as the evidence is。

参考答案与解析

答案： Although the evidence is limited

解析： 两者都表达让步。

表达迁移： 为一位科学家的历史传记写三句评议：让步、旧说的限制、查证方式。

表达参考与点评

Familiar as the story is, its details still need checking. A later retelling may have simplified the scientist’s methods. We should compare the account with documents from the same period.

让步不等于接受传说，后两句从叙事简化转向同期材料查证，呼应科学史解释的修正。

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