劍橋雅思10Test3閱讀Passage2答案解析 Autumn leaves

劍橋雅思10Test3閱讀Passage2答案解析 Autumn leaves

劍橋雅思10 Test3 Passage2閱讀答案解析

第14題答案：C

對(duì)應(yīng)原文：C段：The source of the red is widely known: it is created by anthocyanins

答案解析：C段開頭提到，紅色的來源廣為認(rèn)知：它是有花青素制造出來的。對(duì)應(yīng)題干中為葉子紅色負(fù)責(zé)的物質(zhì)，由此判斷答案為C。

第15題答案：B

對(duì)應(yīng)原文：B段：So rather than maintaining the now redundant leaves throughout the winter, the tree saves its precious resources and discards them

答案解析：B段中間提到，與其在冬天保留這些顯得多余的葉子，樹木選擇節(jié)約寶貴的資源，并遺棄它們。即樹木秋天落葉的原因，由此判斷答案為B。

第16題答案：H

對(duì)應(yīng)原文：H段：Even if you had never suspected that this is what was going on when leaves turn red, there are clues out there.

答案解析：G段主要是理論描述，H段通過一些現(xiàn)象來論證“光屏障”假說。開頭提到，即便你從來都沒有懷疑這就是樹葉變紅時(shí)發(fā)生的事情，仍然有一些線索可以證明。隨后給出了三個(gè)具體的例子。對(duì)應(yīng)題干中some evidence的說法，由此確定答案為H。

第17題答案：B

對(duì)應(yīng)原文：B段：chlorophyll, the molecule that captures sunlight and converts that energy into new building materials for the tree.

答案解析：B段開頭介紹到，葉綠素是捕捉陽(yáng)光，并將其中的能量轉(zhuǎn)化為新的樹木生長(zhǎng)材料的分子，即對(duì)葉綠素功能的解釋。由此確定答案為B。

第18題答案：E

對(duì)應(yīng)原文：E段：vivid red colours to convince herbivorous insects that they are healthy and robust and would be easily able to mount chemical defences against infestation.

答案解析：E段中提到，鮮艷的紅色可能會(huì)讓昆蟲認(rèn)為，樹木很健康，能夠輕易抵抗侵襲。即紅色作為一種警告信號(hào)而存在，由此確定E為答案。

第19題答案：sun (light)

對(duì)應(yīng)原文：H段：on many trees, the leaves that are the reddest are those on the side of the tree which gets most sun

答案解析：根據(jù)標(biāo)題中“l(fā)ight screen”定位到G段和H段。根據(jù)most vividly coloured red與reddest的對(duì)應(yīng)鎖定這句話。從題干中可以判斷，空上應(yīng)該填一個(gè)名詞，而原文中比較合適的只有sun。

第20題答案：upper

對(duì)應(yīng)原文：H段：the red is brighter on the upper side of the leaf

答案解析：這道題沒有明確的對(duì)應(yīng)原文中的詞匯。但根據(jù)上一題和下一題的位置，我們?nèi)匀豢梢詫⒆⒁饬杏谶@句話上。從題干中可以推測(cè)空上應(yīng)該填的是個(gè)形容詞，而且是樹葉的某一部分，由此鎖定upper為答案。

第21題答案：dry

對(duì)應(yīng)原文：H段：It has also been recognised for decades that the best conditions for intense red colours are dry, sunny days and cool nights

答案解析：根據(jù)sunny定位到這句話，題干中要填的是具體的條件，而且是白天的情況，很容易確定dry為答案。

第22題答案：north

對(duì)應(yīng)原文：H段：And finally, trees such as maples usually get much redder the more north you travel in the northern hemisphere.

答案解析：順著上一題往下，從題干中可以推測(cè)空上填的應(yīng)該是個(gè)方向，由此確定north為答案。

第23題答案：FALSE

對(duì)應(yīng)原文：D段：… increase a leaf’s tolerance to freezing. However, there are problems with each of these theories …

答案解析：D段中確實(shí)提到樹葉變紅是為了提升葉子的抗寒性。但隨后就對(duì)這一理論進(jìn)行了反駁?？梢娝⒉怀闪ⅰＳ纱伺袛啻鸢笧镕ALSE。

第24題答案：TRUE

對(duì)應(yīng)原文：F段：… the ‘light screen’ hypothesis. It sounds paradoxical

答案解析：這道題主要考察paradoxical與contradict的同義替換，其他成分在原文中都有出現(xiàn)。只要認(rèn)識(shí)這兩個(gè)單詞，題目就很簡(jiǎn)單。

第25題答案：NOT GIVEN

對(duì)應(yīng)原文：無

答案解析：原文中完全沒有提到這一說法。題目屬于無中生有，由此判斷答案為NOT GIVEN。

第26題答案：B

對(duì)應(yīng)原文：B段：As chlorophyll is depleted, other colours that have been dominated by it throughout the summer begin to be revealed.

答案解析：B段的倒數(shù)第二句提到，隨著葉綠素的消退，其他在夏日里被它主導(dǎo)的顏色顯露出來。即解釋了樹葉在秋天變黃或變橙的原因。而其他選項(xiàng)作者只是描述了相關(guān)現(xiàn)象，并未提供解釋。由此確定B為答案。

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