1.Tropical fish hobbyists will tell you their tanks are a source of relaxation,but recent research suggests the fish might disagree.
Many American households contain a fish tank,whose average size is less than 10gallons.Yet a study comparing the behavior of common freshwater fish found that those kept in such small tanks were more aggressive than those in larger ones and were more likely to fight.
"If people kept dogs in these conditions,they'd be put in prison,"said the author,Ronald Oldfield."In larger tanks,the fish were not in continuous eyesight of each other.They were swimming around,checking everything out rather than beating each other,"he added."It's something we should think about."
The study consisted of two experiments.In one,Dr.Oldfield tested the effects of overcrowding by keeping tank size constant(不變)while increasing the number of fish.In the other,he tested environment by placing three fish in tanks of different sizes.He then recorded their behavior at least two hours after feeding,to eliminate (排除) competitive behaviors related to food.While aggression seemed to remain constant regardless of the number of fish in a tank,it dropped off considerably once the fish were placed in a l00-gallon tank with several plants and rocks to form shelters.
The findings confirmed what he found when observing Midas in the wild."If you go out and observe these fish swimming in a river,"he said,"they're not aggressive at all,really."This conclusion is not news to Justin Muir,the owner of a fish tank business."More volume of water is always better.It keeps the fish healthier,and the tank is more stable."

41.We can conclude from the study thatC.
A.The fish in small rivers are more likely to fight than those in larger ones.
B.If you keep fish in tanks of less than 10 gallons,you'll be put into prison.
C.People haven't paid enough attention to the feeling of fish in smaller tanks.
D.The fish in the wild are more likely to fight than those kept in tanks.
42.The underline word"aggressive"probably meansB.
A.polite         
B.violent          
C.enthusiastic          
D.frightened
43.How was the first experiment performed?A
A.By putting more and more fish in the same tank.
B.By putting fish in tanks of different sizes.
C.By putting some food to test the behavior of fish.
D.By putting fish in a tank with plants and rocks.
44.The two experiments prove thatD.
A.food competition results in the aggressive behavior of fish
B.fish become more aggressive as more fish are put into a tank
C.crowding is the main cause of the aggressive behavior of fish
D.fish become less aggressive when placed in a 100-gallon tank
45.The best title for this passage might beB.
A.Animals'Right to Live at Ease
B.Picture of Relaxation Only if You're Not Inside
C.How to Keep Tropical Fish as Pets
D.How to Deal with Fish's Aggressive Behavior.

分析 本文敘述了熱帶魚的生活習(xí)性.當(dāng)它們的生活空間越小時,它們的侵略性就越強;反之,如果生活空間越大,侵略性越。

解答 41.C 推理判斷題.由第二段和第三段內(nèi)容可知,人們大多把魚養(yǎng)在小的魚缸里,故選C項.A項中講的是河流,而全文講的是魚缸故A項錯誤,由第三段第一句可知B項錯誤;由全文特別是最后一段可知D項錯誤.
42.B 詞義猜測題.根據(jù) those kept in such small tanks were more aggressive than those in larger ones and were more likely to fight.在小的魚缸里更容易發(fā)生打斗,結(jié)合選項說明aggressive是具有暴力性的意思,故選擇B.
43.A 細(xì)節(jié)理解題.由第四段第二句In one,Dr.Oldfield tested the effects of overcrowding by keeping tank size constant(不變)while increasing the number of fish.可知他放了很多的魚在同一個魚缸里,故選A.
44.D 推理判斷題.由倒數(shù)第二段最后一句While aggression seemed to remain constant regardless of the number of fish in a tank,it dropped off considerably once the fish were placed in a l00-gallon tank with several plants and rocks to form shelters.可知,如果把魚放在100加侖的魚缸里,它們會停止攻擊,故選D項.A項太片面;由倒數(shù)第二段最后一句可排除B、C兩項,因此正確選項為D.
45.B 主旨大意題.由短文內(nèi)容可知,作者主要告訴我們魚缸的大小決定魚生活得是否舒適、侵略性的大小,故選B項.

點評 本文是歷史文化類閱讀理解.做這類題材閱讀理解時要求考生對文章通讀一遍,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細(xì)分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).

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