题目：
The following appeared in a letter to the editor of a local newspaper.
“Commuters complain that increased rush-hour traffic on Blue Highway between the suburbs and the city center has doubled their commuting time. The favored proposal of the motorists’ lobby is to widen the highway, adding an additional lane of traffic. But last year’s addition of a lane to the nearby Green Highway was followed by a worsening of traffic jams on it. A better alternative is to add a bicycle lane to Blue Highway. Many area residents are keen bicyclists. A bicycle lane would encourage them to use bicycles to commute, and so would reduce rush-hour traffic rather than fostering an increase.”
Write a response in which you discuss what questions would need to be answered in order to decide whether the recommendation is likely to have the predicted result. Be sure to explain how the answers to these questions would help to evaluate the recommendation.
写作范例（两个主体段落结构）：
In the editorial from a local newspaper, it is stated that opponents of the motorist’s lobby’s plan to add another lane to Blue Highway have advocated that a bike lane be constructed in order to alleviate traffic jam during rush hour. The opponents reach this conclusion based on issues faced by Green Highway as well as the keen interest in bicycling of the local residents. However, before the recommendation can be properly evaluated, two questions need to be answered.
To begin with, are Green Highway and Blue Highway comparable? In other words, can the conclusion that the author reached in Green Highway be applied to make generalizations and predictions about the situation in Blue Highway? It is highly possible that the two highways are totally different: perhaps Green Highway runs through highly populated areas, while Blue Highway passes mostly rural, sparse population sections of the city. Moreover, There is a possibility that the qualities of these two highways are strikingly different, with Green Highway’s roads falling apart and Blue Highway’s existing in pristine condition. If either of these difference is validated, then the conclusion in the original argument will be seriously weakened.
Also, do a majority of the local residents interested in biking live within the biking distance of their places of employment? In this argument, the author assumes that many of the residents in the town will ride a bike instead of drive their cars to work. However, the scenario may be not the case. It is possible that, for most residents, the average distance from home to work is above 20 miles or even more, which is too far for them to ride to work even if they want to do so. Therefore, the residents are essentially obligated to take the highway. In an ideal world, the residents would ride a bike to work, but if the reality is such that they cannot do so because of the logistics of their situations, then driving a car to work via the Blue Highway is the only possible solution. If the above is true, then the validity of the argument will be challenged.
In conclusion, the argument, as it stands now, is seriously flawed due to its reliance on two unwarranted assumptions. If the author is able to answer the two questions above and provide more evidence, then it is possible to fully evaluate the validity of the recommendation to add a bike lane to Blue Highway.
题目中存在的assumptions分析：
A、The author assumes that the Green Highway and Blue Highway are comparable.
B、The author assumes that the bicyclist will use bikes to commute between home and office.
C、The author assumes that the distance between the residents’ home and working place is not so far that they can use bikes to commute.
D、The author is assuming that Green Highway’s traffic problem still exist today.
E、The author also assumes that riding bikes to work will not cause serious traffic problems to influence rush hour traffic.
