TPO43托福聽力真題解析：Lecture1

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TPO43托福聽力解析：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：文章開頭講了為什么秋天葉子會(huì)變成某種特定顏色，即亮紅色；全文來看也是圍繞紅色素，此處為花青素（anthocyanin）來講的，選C。其他項(xiàng)明顯錯(cuò)誤

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：在教授說葉綠素等內(nèi)容時(shí)，提到了我知道這是很老的材料，為了保險(xiǎn)起見，還是復(fù)習(xí)一下為什么葉子通常是綠色的（葉綠素作用）。教授意識(shí)到學(xué)生們熟悉此處內(nèi)容，選B。其它選項(xiàng)錯(cuò)誤明顯。

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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：傳統(tǒng)理論是秋天植物停止合成葉綠素，陽光和低溫使得葉子中的葉綠素開始分解，葉子失去綠色，包含紅色等其他顏色開始顯現(xiàn)。教授之后說這個(gè)理論對(duì)一半，可能可以解釋橙色和黃色，但是解釋不了紅色。而文章之后的大段內(nèi)容也是關(guān)于葉子發(fā)紅的獨(dú)特原因的。選D，其他選項(xiàng)錯(cuò)誤明顯。

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：教授說紅色色素花青素(anthocyanin)在落葉之前一周會(huì)大量合成，教授說此舉對(duì)于植物來說不合常理：為什么要花費(fèi)資源在將要掉落的葉子上？就像給馬上要報(bào)廢的汽車換上新涂裝是一種浪費(fèi)。選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：選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：選D。

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