2017年GMAT考試專項練習及答案

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　　邏輯真題

【邏輯】

Twelve years ago and again five years ago, there wereextended periods when the Darfir Republic's currency, the pundra, wasweak: its value was unusually lowrelative to the world's most stable currencies. Both times a weak pundra made Darfir's manufactured products a bargainon world markets, and Darfir's exports were up substantially. Now some politicians are saying that, inorder to cause another similarly sized increase in exports, the governmentshould allow the pundra to become weak again.

Which of the following, if true, provides the governmentwith the strongest grounds to doubt that the politicians' recommendation, iffollowed, will achieve its aim?

(A) Several of the politicians now recommending that thepundra be allowed to become weak made that same recommendation before each ofthe last two periods of currency weakness.

(B) After several decades of operating well below peakcapacity, Darfir's manufacturing sector is now operating at near-peak levels.

(C) The economy of a country experiencing a rise inexports will become healthier only if the country's currency is strong or therise in exports is significant.

(D) Those countries whose manufactured products competewith Darfir's on the world market all currently have stable currencies.

(E) A sharp improvement in the efficiency of Darfir'smanufacturing plants would make Darfir's products a bargain on world marketseven without any weakening of the pundra relative to other currencies.

　　GMAT邏輯真題答案:

【邏輯】

參考答案: B

思路：措施：the government should allowthe pundra to become weak again

目的：in order to causeanother similarly sized increase in exports

正確答案作用：1. 這個措施做了之後，目的也達不到;2. 一個會有一個“新因素”的介入來讓目的達不到;

思考：Pundra becomes weak之後, export的量會因爲一個新因素的介入而不能增加。

選項分析：A：與export的量會不會增加沒有關係;

C：此選項沒有說出爲什麼export不能增加;

D: 這個選項告訴我們: Darfir的競爭國家全部都有穩定的貨幣.有的同學會這麼思考, 這說明穩定的貨幣很重要, 所以不能貶值pundra. 但是 “措施—目的”文章的重點不是討論措施做不做, 而是討論 “措施做了之後, 目的會不會達到”;

E: 即使不貶值pundra, Darfir的產品在世界市場上的議價能力也會提高.這個跟措施做了之後, 目的達不到,沒有關係.

【邏輯】

Many small roads do not have painted markings along theiredges. Clear edge markings would make iteasier for drivers to see upcoming curves and to judge the car's position onthe road, particularly when visibility is poor, and would therefore seem to bea useful contribution to road safety. However, after Greatwater County painted edge markings on all itsnarrow, winding roads, the annual accident rate along those roads actuallyincreased slightly.

Which of the following, if true, most helps to explainthe increase in accident rate?

(A) Greatwater County has an unusually high proportion ofnarrow, winding roads.

(B) In bad weather it can be nearly as difficult fordrivers to see the road as it is at night.

(C) Prior to the painting of the edge markings,Greatwater County's narrow, winding roads already had a somewhat higheraccident rate than other Greatwater County roads.

(D) Many of the accidents on narrow, winding roadsinvolve a single vehicle veering off the road, rather than the collision of twovehicles.

(E) After the markings were painted on the roads, manydrivers who had gone out of their way to avoid driving on those roads at nightno longer did so.

　　GMAT邏輯真題答案:

【邏輯】

參考答案: E

思路：A：謂語動詞has, 沒有變化;

B: 謂語動詞canbe as difficult, 沒有變化;

C: 時間是矛盾的;

D: 謂語動詞是involve, 較難判斷是否是變化的`。許多事故都是涉及到單個車翻下路，而不是兩車碰撞。那很有可能原來的路上的情況也是這樣的。所以不能解釋爲什麼事故率上升;

E: no longer didso表明了一種變化，並且時間也符合(after….)。以前不在這條路上開車的driver, 現在開始在這條路上開車,所以事故率有了上升。

【邏輯】

The population of Megacity, a sprawling metropolis inRemsland, has grown at a fairly steady rate for over a century. A hundred years ago, poor sanitation in thecity caused high mortality rates among the city's inhabitants, and what fueledthe population increase was immigration from rural villages. This immigration has continued and evenincreased. Moreover, in recent decades,city sanitation has improved enormously. Yet the city's population growth has not significantly accelerated.

Which of the following, if true, most helps to explainwhy the city's population growth rate has not changed?

(A) Mortality rates that were associated with poorsanitation in Megacity a hundred years ago were orders of magnitude higher thanare mortality rates associated with vehicular traffic, which is currently amajor cause of death in the city.

(B) For several decades, Megacity, as distinct from thecountryside, has had a steadily declining birth rate.

(C) Cities smaller than Megacity have also experiencedsustained population growth.

(D) The great majority of immigrants to Remsland settlein Megacity, at least initially.

(E) Megacity has long offered better employment prospectsthan most rural areas.

　　GMAT邏輯真題答案:

【邏輯】

參考答案: B

思路：選項分析：A：這是一個狀態比較, 沒有變化;

C：小於Megacity的城市與本題無關;

D: 大量的移民在Megacity定定居了, 這應該說明Megacity的人口上升, 與現象不符;

E: 沒有變化,又在比較

B: 出生率在下降, 是變化. 此選項告訴我們, 雖然死的人少了,並且移民來的人多了, 但是新出生的少了, 所以人口保持沒有增加. 正確答案

知識點：解釋不變化，解釋矛盾現象