| Reading Passage 2 | |
| Title: | 會(huì)唱歌的鳥(niǎo) |
| Question types: | Heading, summary, sentence completion |
| 文章內(nèi)容回顧 | 主要講了幾種鳥(niǎo)類和哺乳動(dòng)物。講鳥(niǎo)的聲音的新用處，與人的聲音進(jìn)行對(duì)比。 |
| 英文原文閱讀 |
Why birds sing A Red-eyed Vireo sings more than 20,000 songs a day. A Pileated Woodpecker drums on a tree at 15 beats per second. A Wilson's Snipe dives through the air, the feathers on its wings vibrating to produce a winnowing sound, hu-hu-hu...Why? Birds put a lot of effort into singing, drumming, winnowing, and otherwise displaying. They are trying to impress mates and proclaim territories.Songs are often loud and repetitive, so they tend to be noticed more than other bird sounds. One observer commented that a Winter Wren sings "with remarkable vehemence," as if he were "trying to burst [his] lungs." This tiny songster weighs just one-third of an ounce, but it sings with 10 times the power of a crowing rooster, per unit weight. Birds may sing their songs thousands of times throughout the day. Dickcissels may spend as much as 70 percent of the day singing while establishing territories and courting females.Some birds have large repertoires--the Brown Thrasher can sing as many as 2,000 distinct songs. Other species, such as the Henslow’s Sparrow, seem to have only one song. In North America, we hear mostly males singing, because they typically take the lead in defending territories and attracting mates. However, especially in the tropics, some species sing duets involving both the male and female.Courtship serenades How do scientists know why birds sing? Experiments with recorded songs have shown that birds sing to attract mates. House Wren songs broadcast near nest boxes will attract female House Wrens, for example. Female birds may also judge the quality of a male's song when selecting a mate. Some studies have shown that males with extra food on their territories are the most persistent singers, and in some species, the most persistent singers attract females the soonest.Playback experiments have also shown that songs are important in defending a territory. For example, male House Wrens respond aggressively to the recording of another male's song, sometimes even attacking the loudspeaker. In other tests, researchers temporarily removed male birds from their territories but played songs through speakers on some of the territories. Neighboring males were less likely to invade territories from which songs were broadcast, showing that song means "Keep out!" to other birds.Song is not the only "keep out" signal that birds use. Although Northern Mockingbirds sing complex songs on their territories during the breeding season, they use only a loud chuck sound to declare their winter feeding territory. Some warblers also use just a simple call note on their winter feeding territory.Singing on the wing Some birds sing while in flight, especially species that nest in open areas such as grasslands or the Arctic tundra. Male Western Sandpipers arrive in Alaska several days before the females and make frequent display flights over their territories as they utter their flight song. Some display flights last up to five minutes and cover the sandpiper's territory. Others are rapid flights low over the tundra, followed by an abrupt ascent. |
| 題型難度分析 | 據(jù)考生回顧，本篇文章的三個(gè)題目都較好做，很好定位。 |
題型技巧分析 |
Heading題型做題步驟： 1. 讀題目要求，注意是將heading前的序號(hào)寫(xiě)在答題卡上 2. 劃去Example項(xiàng)，在Lists of headings中將例子的標(biāo)題劃去，同時(shí)將對(duì)應(yīng)段落在文章中劃去，以免做題時(shí)重復(fù)找 3. 在給出的標(biāo)題中劃出關(guān)鍵詞，以名詞為主 4. 讀文章段落，主要讀段首和段尾，找出主題句 5. 將段落主題句和標(biāo)題相比較，選出答案 注意事項(xiàng)： 1. 在找主題句的時(shí)候，段首不一定是段落的第一句，很多時(shí)候尤其是第二段及以后的段落，第一句往往是對(duì)上一段的概況，第二句第三句才是主題句 2. 如果本段有however, but等轉(zhuǎn)折詞匯以及also, although等，主題句即作者的中心在其后面 3. 如果某段中重復(fù)出現(xiàn)標(biāo)題中的某個(gè)關(guān)鍵詞，也可以判定此段的標(biāo)題即是含有這個(gè)關(guān)鍵詞的標(biāo)題 |
| 劍橋雅思推薦原文練習(xí) | 劍3 Test4 Passage1 |