17．Everyone knows that if a dog's ears are up and its tail is wagging vigorously，it is definitely pleased to see you．but now scientists using a robot have found that the way dogs use their tails is more complicated than we thought，and that dogs which wag them to the left may be more friendly．The animal psychologists discovered that when real dogs approached a life-sized robot dog，they were less cautious about it when it was wagging its tail to the left，while if it was wagging its tail to the right，far fewer dogs approached it in a confident manner．
In the first experiments，56percent of the animals approached the model without hesitation when the tail was wagged to the left，while only 21percent did so in the other situation．When the researchers excluded（排除）owners from being present，the result were：31percent of the dogs approached continuously when the tail was wagging to the left，while only 18percent did so when it was on the right．
Animal psychologist Roger Mugford said it added to the growing evidence that dogs were even more complicated communicators than the animals more closely related to man such as monkeys．He said，"We know that dogs，in a sense，have languages，but it is more complicated because it is not just them wagging their tails，but also giving out chemical displays．"
He adds，"The research confirms earlier studies suggesting that dogs，like humans，had a left-side preference．If you are going to present a signal to a dog，it is sensible to put it on your left-hand side because that is where dogs，unlike most other animals，tend to look．It is another example of the similarity between dogs and humans．They are a lot more human than we give them credit for．"
32．What does it tell us if a dog wags its tail to the right？C
A．It was very energetic．
B．It was in a good mood．
C．It might be unfriendly．
D．It must be confident．
33．What can be inferred from the second paragraph？D
A．Few dogs approached the robot dog confidently．
B．More dogs approached the robot without their owners present．
C．Some dogs lacked confidence with their owners present．
D．Dog owners may influence the behaviour of their dogs．
34．What can we learn from animal psychologist's experiments？C
A．Dogs can communicate more than human beings．
B．Dogs have more complicated emotions than monkeys．
C．Dogs'tail-wagging conveys more information than previously believed．
D．Dogs'intelligence can be much higher than any other kind of animal．
35．What do Roger Mugford's words mean？B
A．The Left-side preference should be studied further．
B．Dogs have more in common with humans than we think．
C．No other animals show the left-side preference except dogs．
D．Dogs have a more complicated language than we people do．
分析 科學(xué)實驗表明：狗搖尾巴傳達了更多的我們以前不知道的信息，并且狗和人類還有許多我們以前不知道的相似性．
解答 32．C．細(xì)節(jié)理解題．根據(jù)第一段dogs which wag them to the left may he more friendly．while if it was wagging its tail to the right，far fewer dogs approached it in a confident manner．和第二段的實驗結(jié)果可知如果狗往右側(cè)搖尾巴，說明它不友好，很少有其他狗接近它．故選C．
33．D．細(xì)節(jié)理解題．根據(jù)第二段實驗中提到的When the researchers excluded（排除）owners from being present可知主人是否在場會影響狗的行為，故選D
34．C．細(xì)節(jié)理解題．根據(jù)文章He said，"We know that dogs，in a sense，have languages，but it is more complicated because it is not just them wagging their tails，but also giving out chemical displays可知我們可以從動物心理學(xué)家的實驗中學(xué)到狗搖尾巴傳達比以前認(rèn)為的更多信息；故選C
35．B．推理判斷題．根據(jù)最后一段The research confirms earlier studies suggesting that dogs，like humans，had a left-side preference．和It is another example of the similarity between dogs and humans．They are a lot more human than we give them credit for．可知狗和人類有許多我們以前不知道的相似性，故選B．
點評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時一定要找到文章中的原句，和題干進行比較，再做出正確的選擇．在做推理判斷題不要以個人的主觀想象代替文章的事實，要根據(jù)文章事實進行合乎邏輯的推理判斷．
