请教达人3道XDF蓝皮书语法解析

今天在总结做过的语法题，有３题语法，不知道怎么解，就上ＣＤ拜托达人了，小女子在这先拜谢啦．

１：His studies of ice-polished rocks in his Alpine home-land, far outside the range of present-day glaciers, led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets had existed in now currently temperante areas.

A in which great ice sheets had existed in now currently temperate areas.

B.in which great ice sheets existed in what are now temperate areas

C.When great ice sheets existed where there were areas now temperate .

D.when great ice sheets had existed in current temperate areas.

E.when great ice sheets existed in areas now that are temperate.

2:The airline industry is cutting its lowest discount fares more widely, more substantially, and earlier this year than it normally does at the end of the summer, a time during which travel usually decreases and the industry uses some lower fares for the attraction of passengers.

A: the same as the underlined sentence mentioned above

B. during which travel usually decrease and therefore the industry will use some lower fares for the attraction of

C.in which travel usually decreases and in which the industry therefore uses some lower fares attracting.

D,when travel usually decreases and the industry uses some lower fares to attract

E. when travel usually decreases and therefore the industry will use lower fares for the attraction of

3:Clark and Florence , a husband-and-wife medical team, worked steadily and sfficiently through the night, but sipping their coffee the next morningm, she noticed that he seemed disoriented.

A the same as the underlined sentence mentioned above.

B,sipping their coffee the next moring ,he seemed to be disoriented, she noticed

C. as they sipped their coffee the next morning, she noticed that he seemed disoriented.

D. as they were sipping their coffee the next morning, he seemed, she noticed, disoriented

E.he seemed dioriented she noticed, sipping their coffee the next moring.

答案分别选Ｂ，Ｄ，Ｃ，先拜托了啦，

1.an age 后跟in which要比when好，排除CDE；没有明确时间状语要求用had existed，故选A

2.动词attract优于抽象名词attraction，抽名优于动名词attracting，排除ABCE

  from XDF：动词>形容词>抽象名词>分词动名词>从句

  另，表示目标，用to do

3.我不太清楚，CD看起来都挺对的，求教

恩,先谢谢啦,第三题,是不是在sipped 和 were sipping 上有区别啊?可哪里有提示要用现在进行时呢?晚上读了又有两题不明白，请教请教哈．

4:A New York City ordinance of 1897 regulated the use of bicyles, mandated a maximum speed of eight miles an hour, required of cyclists to keep feet on pedals and hands on handlebars at all times, and it granted pedestrians right-of-way.

A.the same as the underlined sentence mentioned above.

B. regulated the use of bicycles,mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, granting

C. regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists that they keep feet on pedals and hands on handlebars at all times, and it granted.

D. regulating the use of bicycles, mandating a maximum speed of eight miles an hour, requiring of cyclists that they keep feet on pedals and hands on handlebars at all times, and granted.

E. regulating the use of bicycles mandated a maximum speed of eight miles an hour, required cyclists to keep feet on pedals and hands on handlebars at all times, and granted.

5: Even as they never forgave the Crusades who  overran their homeland, the Syrians have never absolved the French for taking territory from them.

A:Even as they never forgave.

B:While they never forgave

C:Just like they never forgave

D:Similarly to not forgiving

E:In spite of their never forgiving

答案是第四选E,第五选A