由垃圾渗出物所导致的污染问题，在那些人均产值为每年4000至5000美元之间的国家最严重，相对贫穷或富裕的国家倒没有那么严重。工业发展在起步阶段，其污染问题都比较严重，当工业发展能创造出足够多的手段来处理这类问题时，污染问题就会减少。目前X国的人均产值是每年5000美元，未来几年，X国由垃圾渗出物引起的污染会逐渐减少。
假设以下哪项能使上述结论合乎逻辑地得出？
1904年，湖南、四川、江苏、广东、福建等长江流域与东南沿海9个省份留日学生共计1883人，占全国留日学生总数的78%，直隶亦有172人，山西、陕西等其他十几个省区仅有351人，影响留日学生区域分布不平衡的主要因素是( )
【专题 GMAT逻辑题】
The heavy traffic in Masana isa growing drain on the city’s economy-the clogging of the streets of thecentral business district alone cost the economy more than$1.2 billion over thepast year. In order to address this problem, officials plan to introducecongestion pricing, by which drivers would pay to enter the city’s most heavilytrafficked areas during the busiest times of the day.Which ofthe following, if true, would most strongly indicate that the plan will be asuccess?
A.Approximately one-fifth of the vehicles in the central business district are intransit from one side of the city to the other.
B.Planners expect that, without congestion pricing, traffic in Masana is likelyto grow by 6 percent in the next five years.
C. Inother urban areas, congestion pricing has strongly encouraged carpooling(sharing of rides by private commuters).
D.Several studies have shown that a reduction in traffic of 15 percent in Masanacould result in 5, 500 or more new jobs.
E. Over30 percent of the vehicles in the city’s center are occupied by more than oneperson.
【专题 GMAT逻辑题】
Which of the following mostlogically completes the argument? Sviatovinis a medieval Moringian text whose author and exact date of composition areunknown. However, the events in the life of Prince Sviatov that the textdescribes occurred in 1165, and in the diagram of Sviatov’s family thataccompanies the text his father, who died in 1167, is identified as stillliving. Thus Sviatovin must have been written between 1165 and 1167, assuringthat.
A. thelife of Prince Sviatov is not the subject of any other medieval Moringian texts
B. theauthor of Sviatovin intended it to provide as accurate a report about PrinceSviatov's exploits as possible
C. thediagram accurately represents the composition of Sviatov's family at thetimeSviatovin was written
D.Sviatovin is the earliest Moringian text whose composition can be dated towithin a few years
E Sviatovin was not written by Sviatov's father himself
在某次税务检查后，四个工商管理人员有如下结论：
甲：所有个体户都没纳税。
乙：服装个体户陈老板没纳税。
丙：个体户不都没纳税。
丁：有的个体户没纳税。
如果四个人中只有一人断定属实，那么以下哪项是真的？
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