【正文】 tracted to the flower’s strong smell have to carry pollen from one flower to the other, so how often do you think these events occur all together even people who study the plant for years may never witness it.中文大意：教授一開始就介紹植物分類，提到分類中的species(種)，genus(屬)，order(目)。她舉了只生長在Malaysia和Indonesia 的一種植物Rafflesia.它的花很特別，超級大，可以長到一尺寬，七公斤重，有像腐肉一樣難聞的氣味，以吸引蠅類傳播花粉。接著教授提到生長在東南亞的另一種植物Mitrastema.這種植物也是一種寄生植物，因此有人認(rèn)為它和 Rafflesia 隸屬于同一目。實(shí)際上它和藍(lán)莓才是近親。教授說，為何不用植物DNA 鑒別？因?yàn)檫@種大花基本上不進(jìn)行光合作用，沒法提取DNA. 后來分析了很多種植物后，終于確認(rèn)了Rafflesia的 order. 而令人感到意外的是，其他同一個order 的植物包括passion flower, violet, willow 等。后來又講了這種花可能滅絕，因?yàn)樯L環(huán)境被破壞，更重要的原因是這種植物繁殖不易。要這些條件同時發(fā)生，幾率很小。2. How does a strong odor help Rafflesia?Answer: (D) 吸引flies過來，幫他傳粉。4. 為什么不能用DNA分類？Answer: 不能進(jìn)行光合作用。6. 為什么很難繁殖？（click two）Answer ：a. male 和 female 交配 b. fly 傳粉，兩個同時發(fā)生的幾率很小。 it was fresh and new, it was the first kind of mainstream music that used AfricanAmerican rhythms and that was exciting, and finally the music and even lyrics reflected the restless energy and optimism of young people. Can you see how it could capture the spirit of American youth? Just like Rock would do 50 years later?So, getting back to the piano, of all instruments. As I said before, its unique design was part of the appeal, which was well suited to the style and rhythm of Ragtime music, but there were other reasons why it was so poplar. Remember, this was the time before the advent of the automobile. The piano was a symbol of respectability, a symbol of success. Other than a house, it had represented, for many families, their biggest single purchase, and even though not everyone could afford it, everyone wanted to enjoy. So, wherever you would go, restaurants, theaters, the main instrument used for indoor public musical entertainment, was the piano. But let’s not leave out the sound quality.Few people realize how powerful the pianos used at that time were, they used the big types of pianos then, before the smaller pianos like Spinets came into fashion. The Ragtimeera pianos could produce a sound that was so full, it would even resonate through the wooden floors of any building, be it a home, concert hall or whatever! This full sound itself had the listeners actually feeling these unique and exciting piano vibrations though their feet and bones.S:Wow! I never thought of that. So… they… the piano and the ragtime style were perfect for each other.P: Well… in a sense… yes. But granted, although the piano’s sound quality was exceptional, there were benefits to using other instruments to play Ragtime. For instance, events like parades, and park concerts, required instruments that were easier to transport, like the banjo and et. Nevertheless, the piano played such a fundamental role in Ragtime. In fact, its sound quality alone contributed to piano sales peaking in 1909 roughly the midpoint of the Ragtimeera. It’s no coincidence that the number of published piano rags, or sheet music, also reached their peak their very same year.S: It’s too bad that Ragtime music isn’t still around, I kind of liked some of the music from that era.P: Well, just like all music, it went through some major transitions. It began as a fixed form of music. It always had to be played as written, but that was in the beginning. Eventually, it evolved into a form of music that’s still around today. Can you guess what? S: Hm… I’d say since its rhythm is a lot like jazz, that’s got to be it.P: You got it! You could almost say that jazz is an improvised kind of Ragtime music. So you see, because of jazz, we still have the remnants of Ragtime around.中文大意：文章介紹了一種流行于美國十九世紀(jì)的一種音樂Ragtime, 就像某一時期的Rock and Roll一樣，那個時代的年輕人非常喜歡這種音樂。然后講到Piano, 說piano’s sound quality 很適合彈奏Ragtime Music(有題)。再加上，當(dāng)時汽車還未普及，所以買Piano是當(dāng)時家庭financial status的象征（有題），所以鋼琴的銷量和Ragtime music 的流行有關(guān)系。教授說其實(shí)Ragtime 就是現(xiàn)在Jazz 的前身，只不過Ragtime 是固定的，而jazz是 improvise(有題)， 因?yàn)檠葑嗾卟话闯＠沓雠?，一首曲子七個人彈奏，彈出七個調(diào)，Ragtime music 這種音樂影響很