【GWD几道题，大家帮帮忙~~】

水色青空

GWD5-Q33:
Wolves generally avoid human settlements.  For this reason, domestic（驯养的） sheep, though essentially easy prey for wolves, are not usually attacked by them.  In Hylantia prior to 1910, farmers nevertheless lost considerable numbers of sheep to wolves each year.  Attributing this to the large number for wolves, in 1910 the government began offering rewards to hunters for killing wolves.  From 1910 to 1915, large numbers of wolves were killed.  Yet wolf attacks on sheep increased significantly.
Which of the following, if true, most helps to explain the increase in wolf attacks on sheep?
A. Populations of deer and other wild animals that wolves typically prey on increased significantly in numbers from 1910 to 1915.
B. Prior to 1910, there were no legal restrictions in Hylantia on the hunting of wolves.
C. After 1910 hunters shot and wounded a substantial number of wolves, thereby greatly diminishing these wolves’ ability to prey on wild animals.
D. Domestic sheep are significantly less able than most wild animals to defend themselves against wolf attacks.
E. The systematic hunting of wolves encouraged by the program drove many wolves in Hylantia to migrate to remote mountain areas uninhabited by humans.
答案是C，我想C 的意思是由于大量捕杀狼，使得狼捕杀野生动物的能力降低，只能捕杀羊。可是文中最后一句只是说了attacks on sheep,而没有强调是domestic sheep啊？我选的是E，我的理解是狼跑到别的地方去吃野生的羊了~~o(╯□╰)o

最疑惑的一道题！！！~~
GWD5-Q38:
Nitrogen dioxide is a pollutant emitted by automobiles.  Catalytic converters, devices designed to reduce nitrogen dioxide emissions, have been required in all new cars in Donia since 1993, and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country.  Yet although the proportion of new cars in Donia’s capital city has always been comparatively high, nitrogen dioxide emissions there have showed only an insignificant decline since 1993.
Which of the following, if true, most helps to explain the insignificant decline in nitrogen dioxide emissions in Donia’s capital city?
A. More of the cars in Donia’s capital city were made before 1993 than after 1993.
B. The number of new cars sold per year in Donia has declined slightly since 1993.
C. Pollutants other than nitrogen dioxide that are emitted by automobiles have also been significantly reduced in Donia since 1993.
D. Many Donians who own cars made before 1993 have had catalytic converters installed in their cars.
E. Most car trips in Donia’s capital city are too short for the catalytic converter to reach its effective working temperature.
答案是E。。。。。这个选项的意思我就没有看懂，我选的是A，我的理解是，因为首都更多车是在1993年以前生产的，所有没有这个装置（文中说了对1993以后的new cars 要求装）
那么自然，效果不明显啊~~为什么会是E？？？？帮帮忙吧！！~~

水色青空

自己顶~~

水色青空

http://bbs..org/dispbbs.asp?boardid=40&id=194365&page=10



http://bbs..org/TopicOther.asp?t=5&BoardID=40&id=193639

水色青空

老车的排放量不变，污染物的减少和增加都应该体现在新车的排放量上，除非文章说老车的排放量有增加的趋势