【正文】 ch is a type of grapevine. I mean… it grows inside its host until it blooms—it doesn’t bloom inside the host. But that leads me to … I want to tell you really quickly about another plant, a plant that’s also from the forests of Southeast Asia, called Mitrastema.Now, Mitrastema is also a parasite, which led some to believe that Rafflesia was related to Mitrastema—that they belong to the same order. Mitrastema as I said is a parasite, but its flowers are much smaller, and don’t smell bad, so you can see why there was debate about whether tey were related. But as it turns out, Mitrastema is actually related to blueberries. So, even plants that share an unusual characteristic with Rafflesia are not related to it. And, um… no plant shares all three of its unusual characteristics, and that made classifying Rafflesia very, very difficult.Now, you are probably thinking, why don’t they just analyze the DNA of the plant well, as I said, Raflesia is a parasite. It lacks the leaves。它是一種寄生植物，因此不靠太陽(yáng)獲取能量，而是靠他的宿主，在開花前，一直長(zhǎng)在宿主里，但是開花開在外邊。由于沒(méi)有植物的特征和Rafflesia的主要特征完全相同，因此使得Rafflesia的歸類相當(dāng)困難。首先，它需要一年成長(zhǎng)；又要同種的花在一起，而且要有flies幫忙傳粉。3. Why does the professor consider the actual classification of Rafflesia unexpected?Answer: (A) 這些植物的特征和大王花不同。7. lecture: Ragtime Music(拉格泰姆音樂(lè))文章：P: Often times we talk about the popularity of music, but we don’t always think about the role that the instruments play in their popularity. To give you an idea of what I mean, just take Ragtime music for instance. Without the piano, Ragtime music certainly wouldn’t have evolved in the late 1800’s the way that it did. I mean… characteristics like the keys, and the chords, made the piano suitable for playing the separate parts of the music: the melodies, rhythms, harmonies, at the same time. So, with one hand you could play the melody, wile playing the harmony with the other. All the while maintaining the rhythm, all characteristic of Ragtime music. In other words, the piano allowed musicians to create the lively sound of Ragtime music unlike any other instruments of their time.And for about 20 years, Ragtime music was America’s most popular music, particularly the piano rag, although some people didn’t exactly embrace Ragtime, young people in general especially liked it.S: Kind of like Rock and Roll in the 50s.P: without a doubt. I mean of course Ragtime in 1900 didn’t sound at all like Rock and Roll did in 1950, but I’d say that’s a fair parison. Ragtime generated the same kind of excitement that other kinds of music like Rock and eventually Rap did.S: Really? Well, with Rock and Rap, I get why they are popular, but when it es to Ragitme, well… I don’t get it.P: Ok, lets take a moment to look at what Ragtime music was about。那個(gè)年代大家都沒(méi)錢，就去public concert or restaurant 這些地方去聽音樂(lè)，而piano聲音夠響亮，又和Ragtime Music rhythm 配合得好， 使得 Ragtime Music and piano 相得益彰。題目：1. What is the main idea of the lecture?Answer:(C) How does piano contribute to the Ragtime music.2. Why the music is popular?Answer: (C) it expressed the spirit of the young people.3: Two reasons of using piano of Ragtime.Answer: a. sound quality b. they reflected their wealth and social status.3. Why does the professor mention about parade and park concert?Answer: (B) to explain the piano might be replaced by other instruments sometimes.4. What does the professor say about jazz?Answer: (A) jazz is improvised form of Ragtime music.5. (replay)S: With Rock and Roll I can see why it’s popular. But when it es to Ragtime, well… I don’t get it!Answer: (D) asks for explanation.。除了流動(dòng)演出外，例如parade和 park concert, piano演奏時(shí)可能被其它樂(lè)器取代，because of transportation problem(有題)。此時(shí)，一個(gè)女生說(shuō)：“With Rock and Roll I can see why it’s popular. But when it es to Ragtime, well… I don’t get it!(有題)Ragtime為什么會(huì)流行？因?yàn)槿诤狭死∶乐尬幕?，表達(dá)了年輕人的心聲（有題）。5. 關(guān)于教授說(shuō)的繁殖問(wèn)題，哪項(xiàng)是對(duì)的？Answer: 很少有人看到他繁殖。題目：1. What is the lecture mainly about?Answer: (C) 植物的分類很