TPO43托福听力真题解析：Lecture1

新托福TPO听力是托福听力部分备考最好、最有效的复习材料。今天，托福名师团队为大家分享TPO43托福听力真题Lecture1解析，供大家学习使用，希望对广大考生有所帮助。

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TPO43托福听力解析：Lecture 1

 1. What is the main purpose of the lecture?

A.To explain how the red pigment in leaves breaks down
B.To show that leaf color varies based on the tree species
C.To introduce a theory about why leaves turn a particular color
D.To explain how chlorophyll protects trees in autumn

解析：文章开头讲了为什么秋天叶子会变成某种特定颜色，即亮红色；全文来看也是围绕红色素，此处为花青素（anthocyanin）来讲的，选C。其他项明显错误

2.What does the professor imply when she explains why leaves are green?

A.She wants to correct a common misconception about the topic.
B.She thinks the students are probably already familiar with the material.
C.She believes the process is too complicated to discuss in depth.
D.She knows that students are often confused about the functions of chlorophyll

解析：在教授说叶绿素等内容时，提到了我知道这是很老的材料，为了保险起见，还是复习一下为什么叶子通常是绿色的（叶绿素作用）。教授意识到学生们熟悉此处内容，选B。其它选项错误明显。

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3. What does the professor mean when she says that the classic theory is partially right?

A.It describes what happens in the summer but not what happens in autumn
B.It describes what happens in tree leaves but not what happens in leaves of other plants
C.It explains how pigments are synthesized but not how they break down.
D.It explains some cases of color change in tree leaves but not all cases.

解析：传统理论是秋天植物停止合成叶绿素，阳光和低温使得叶子中的叶绿素开始分解，叶子失去绿色，包含红色等其他颜色开始显现。教授之后说这个理论对一半，可能可以解释橙色和黄色，但是解释不了红色。而文章之后的大段内容也是关于叶子发红的独特原因的。选D，其他选项错误明显。

4. Why does the professor mention painting a car?

A.To question why a large amount of anthocyanin is produced just before leaves fall
B.To explain why most leaves turn red instead of other colors
C.To remind students how cooler temperatures affect the color of leaves
D.To show how anthocyanin absorbs sunlight to produce food for trees

解析：教授说红色色素花青素(anthocyanin)在落叶之前一周会大量合成，教授说此举对于植物来说不合常理：为什么要花费资源在将要掉落的叶子上？就像给马上要报废的汽车换上新涂装是一种浪费。选A。

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5. The professor mentions theories about why leaves turn red that involve predatory insects and fungi. What is her opinion about those theories?

A.They are based on careful research.
B.They do not completely explain the phenomenon.
C.They have not received enough attention.
D.They have been proved to be incorrect.

解析：选B。

6. According to the professor, why does anthocyanin appear on the upper side of some leaves?

A.To help chlorophyll absorb the sunlight 
B.To maximize the leafs utilization of sunlight
C.To accelerate the breakdown of chlorophyll
D.To protect an important process from the sunlight

解析：选D。

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