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全套三册的《GMAT考试官方指南》包括：《GMAT考试官方指南》; 《GMAT定量推理官方指南》和《GMAT文本逻辑推理官方指南》，共收录了1500余道历届GMAT考试真题，包含220多道从未公布过的GMAT真题和答案解析。

GMAT官方指南/OG-CR新题精选：

Candle Corporation’s television stations are likely to have more income from advertisers than previously. This is because advertisers prefer to reach people in the 18- to 49-year-old age group and the number of people in that group watching Candle television is increasing. Furthermore, among Candle viewers, the percentage of viewers 18 to 49 years old is increasing.

Which of the following, if true, would most strengthen the argument that Candle Corporation will receive more income from advertisers?

(A) Advertisers carefully monitor the demographic characteristics of television audiences and purchase advertising time to reach the audiences they prefer to reach.

(B) Among people over 49 years old, fewer viewers of Candle stations buy products advertised on television than do viewers of other stations.

(C) There will be increasingly more advertisements on television that are directed at viewers who are over 49 years old.

(D) Candle stations plan to show reruns of television shows during hours when other stations run shows for the first time,

(E) People 18 to 49 years old generally have less disposable income to spend than do people over 49 years old.

Argument Evaluation

Situation Both the number and the percentage of Candle television viewers who are 18 to 49 years old are increasing. Advertisers prefer to reach people in this age group.

Reasoning What evidence, when combined with the cited facts, would most support the prediction that Candle will receive more income from advertisers? The argument assumes that the increasing number and percentage of Candle viewers in the age group that advertisers prefer to reach will probably encourage advertisers to spend more on advertising with Candle. This assumption could be supported by evidence that the advertisers realize that Candle is getting more viewers in that preferred age range or by evidence that this awareness will influence the advertisers’ purchase of advertising time.

A Correct. Advertisers monitoring demographics will probably realize that Candle has increasing numbers of viewers in their preferred age range. If they purchase advertising to reach viewers in that age range, then they will probably purchase more advertising time with Candle.

B This gives advertisers less reason to advertise on Candle to reach viewers over 49 years old. Other things being equal, that makes Candle likely to receive less income from advertisers, not more income.

C Since the percentage of Candle viewers 18 to 49 years old is growing, the percentage over 49 years old is probably shrinking. This could make advertisers seeking to reach older viewers less inclined to advertise on Candle even as they increase their overall television advertising.

D Advertisers are not necessarily inclined to purchase more advertising during showings of reruns than during original airings of television shows and may even be inclined to purchase less advertising during such showings.

E This gives advertisers less incentive to try to reach audiences between 18 and 49 years old and hence less reason to purchase advertising on Candle.

GMAT官方指南/OG-DS新题精选：

1、What is the value of t?

(1) s + t =6 + s

(2) t3 = 216

Algebra Equations

(1) Given that s + t = 6 + s, subtracting s from both sides gives t = 6; SUFFICIENT

(2) Given that t3 = 216, taking the cube root of both sides gives t = 6; SUFFICIENT.

The correct answer is D; each statement alone is sufficient.

2、Is w + h4 positive?

(1) h is positive.

(2) w is positive.

Arithmetic Properties of numbers

(1) Given that h is positive, then w + h4 can be positive (for example, when w = 1 and h = 1) and w + h4 can be negative (for example, when w = -2 and h = 1);

NOT sufficient.

(2) Given that w is positive, then because h4≥0, it follows that w + h4 ≥ w + 0 = w and thus w + h4 > 0 since w>0; SUFFICIENT

The correct answer is B; statement 2 alone is sufficient.

GMAT官方指南/OG-PS新题精选：

On a vacation, Rose exchanged $500.00 for euros at an exchange rate of 0.80 euro per dollar and spent of the euros she received. If she exchanged the remaining euros for dollars at an exchange rate of$1.20 per euro, what was the dollar amount she received?

(A) $60.00 (B)$80.00

(C) $100.00 (D)$120.00

(E) $140.00 Arithmetic Operations with rational numbers At the exchange rate of 0.80 euro per dollar, Rose exchanged$500.00 for (0.80)(500) = 400 euros. She spent (400) = 300 euros, had 400 − 300 = 100 euros left, and exchanged them for dollars at the exchange rate of \$1.20 per euro. Therefore, the dollar amount she received was (1.20)(100) = 120.00.

GMAT官方指南/OG-SC新题精选：

Recent interdisciplinary studies advance the argument that emotions, including those deemed personal or private is a social phenomenon, though one inseparable from bodily response.

(A) private is a social phenomenon, though one inseparable

(B) private, are social phenomena that are inseparable

(C) private are a social phenomenon but are not those separable

(D) private—are social phenomena but not separable

(E) also as private emotions, are social phenomena not inseparable

Agreement; Rhetorical construction

The main problem is one of agreement: in the subordinate clause starting with that, the subject is the plural emotions, which demands the verb are, not is. Also, the phrase starting with including is a parenthetical expression that needs to be set off from the rest of the clause, with some punctuation to indicate a pause at its end (after private).

A The verb form is is incorrect, and should instead be are; the parenthetical expression is not separated at its end from the rest of the clause.

B Correct. Are is the correct agreeing verb form, and the comma after private correctly sets off the parenthetical expression.

C Are is correct, but nothing after private sets off the parenthetical expression from the subsequent material. In addition, not those separable is awkwardly phrased; it would be better as not separable or inseparable as in the correct answer choice B.

D The dash would be correct to set off the parenthetical expression only if including had been immediately preceded by a dash; otherwise a comma is needed. The phrase not separable is awkward; it would be better as are not separable or are inseparable.

E The phrase also as private emotions is wordy and unidiomatic. The phrase social phenomena not inseparable not only does not express the intended meaning, but is also awkward without a verb and a relative pronoun such as that: a better phrasing is social phenomena that are not separable.

GMAT官方指南/OG-RC新题精选：

Line Much research has been devoted to investigating

what motivates consumers to try new products.

Previous consumer research suggests that both the

price of a new product and the way it is advertised

(5) affect consumers’ perceptions of the product’s

performance risk (the possibility that the product will

not function as consumers expect and/or will not

provide the desired benefits). Some of this research

has concluded that a relatively high price will reduce

(10) a consumer’s perception of the performance risk

associated with purchasing a particular product,

while other studies have reported that price has little

or no effect on perceived performance risk. These

conflicting findings may simply be due to the nature

that the presentation of an advertised message has a

marked effect on the relationship between price and

perceived performance risk.

Researchers have identified consumers’ perception

(20) of the credibility of the source of an advertised

message—i.e., the manufacturer—as another factor

affecting perceived performance risk: one study

found that the greater the source credibility, the lower

the consumer’s perception of the risk of purchasing

(25) an advertised new product. However, past research

suggests that the relationship between source

credibility and perceived performance risk may be

more complex: source credibility may interact with

price in a subtle way to affect consumers’ judgments

(30) of the performance risk associated with an advertised product.

Questions 415-418 refer to the passage.

415. According to the passage, the studies referred to in line 12 reported which of the following about the effect of price on consumers’ perception of the performance risk associated with a new product?

(A) Although most consumers regard price as an important factor, their perception of the performance risk associated with a new product is ultimately determined by the manufacturer’s reputation.

(B) Price interacts with the presentation of an advertised message to affect perceived performance risk.

(C) Price does not significantly affect consumers’ perception of the performance risk associated with a new product.

(D) Consumers tend to regard price as more important than the manufacturer’s credibility when they are buying from that manufacturer for the first time.

(E) Consumers are generally less concerned about a new product’s performance risk when that product is relatively expensive.

416. The “past research” mentioned in line 25 suggests which of the following about perceived performance risk?

(A) The more expensive a new product is, the more likely consumers may be to credit advertised claims about that product.

(B) The more familiar consumers are with a particular manufacturer, the more willing they may be to assume some risk in the purchase of a new product being advertised by that manufacturer.

(C) Consumers’ perception of the performance risk associated with a new product being advertised may be influenced by an interplay between the product’s price and the manufacturer’s credibility.

(D) Consumers may be more likely to believe that a product will function as it is advertised to do when they have bought products from a particular manufacturer before.

(E) The price of a particular advertised product may have less impact than the manufacturer’s credibility on consumers’ assessment of the performance risk associated with that product.

417. The passage is primarily concerned with

(A) challenging the implications of previous research into why consumers try new products

(B) suggesting new marketing strategies for attracting consumers to new products.

(C) reconciling two different views about the effect of price on consumers’ willingness to try new products

(D) describing a new approach to researching why consumers try new products

(E) discussing certain findings regarding why consumers try new products

418. Which of the following, if true, would most tend to weaken the conclusions drawn from “some of this research” (see line 8)?

(A) In a subsequent study, consumers who were asked to evaluate new products with relatively low prices had the same perception of the products’ performance risk as did consumers who were shown the same products priced more expensively.

(B) In a subsequent study, the quality of the advertising for the products that consumers perceived as having a lower performance risk was relatively high, while the quality of the advertising for the products that consumers perceived as having a higher performance risk was relatively poor.

(C) In a subsequent study, the products that consumers perceived as having a lower performance risk were priced higher than the highest priced products in the previous research.

(D) None of the consumers involved in this research had ever before bought products from the manufacturers involved in the research.

(E) Researchers found that the higher the source credibility for a product, the more consumers were willing to pay for it.