gre數(shù)學(xué)考試照理說應(yīng)該是中國學(xué)子的強(qiáng)勢科目，但大家卻因為看不懂gre數(shù)學(xué)考試題目而失分，這是非常令人抱憾的，下面小編就和大家分享gre數(shù)學(xué)考試出題原則，來欣賞一下吧。

gre數(shù)學(xué)考試出題原則你清楚嗎?

在gre數(shù)學(xué)考試中，一般都假定以下信息為真：

●All numbers used are real numbers;

●All figures lie on a plane unless otherwise indicated;

●All angle measures are positive;

●All lines shown as straight are straight. On the computer-based test， lines that appear“jagged" can also be assumed to be straight (lines can look somewhat jagged on the computer screen)：

●Figures are intended to provide useful information for answering the questions. However，except where a figure is accompanied by a“Note" stating that the figure is drawn tO scale， solve the problem using your knowledge of mathematics， not by visual measurement or estimation.

細(xì)心的讀者會發(fā)現(xiàn)，上述假設(shè)實際上就是gre數(shù)學(xué)考試出題原則，即：

●所有的數(shù)都是實數(shù);

●除非gre數(shù)學(xué)考試題目中專門指出假設(shè)所有圖形都在同一個平面內(nèi);

●所有的角的測量值都是正數(shù);

●所有顯示為直線的線均可當(dāng)作直線來處理(在機(jī)試中，因為電腦顯示器的原因，直線可能會看起來呈“鋸齒狀”);

●伴隨問題的圖形將為解題提供有用的信息。但是，只有在GRE數(shù)學(xué)的問題中指出本圖形是按比例畫出(drawn to scale)時，才可以用目測或估計而得到的信息去解題。否則，只能運(yùn)用你的數(shù)學(xué)知識去回答問題。這一解題原則可以簡稱為“只能讀圖，不能度量”的原則。

GRE閱讀高分備考的重點(diǎn)

一：有一定的詞匯量

GRE閱讀所需掌握的單詞要少的多，這些詞往往都是些GRE閱讀專屬詞匯，且重復(fù)率很高，只需集中背記一下就可以解決基本問題。

二：選答案有方法、有技巧

GRE閱讀的答案的確是有一些特點(diǎn)的。有一些答案一看就是正確答案，說得客觀嚴(yán)謹(jǐn)、小心翼翼，有的一看就是錯的，這里面包含一些特定的規(guī)律。

三：對句子有基本的理解能力

GRE閱讀有很多閱讀技巧，但它只是一種錦上添花的東西，要在你對文章的大意甚至對一些具體的內(nèi)容有一定的理解的基礎(chǔ)上才能發(fā)揮作用，而這個基礎(chǔ)就體現(xiàn)在對句子的理解上。

四：熟悉考點(diǎn)和題型

GRE閱讀考了很多年，已經(jīng)呈現(xiàn)出了明確、固定的出題點(diǎn)和試題類型，考生應(yīng)該對它們有充分的了解。

五：智慧讀原文

要靠讀懂全文來做對題，對中國考生來說是一件很難的事情，即使把文章全部翻譯成中文，也很難在如此短的時間內(nèi)逐字逐句理解全文，更何況是生詞連篇、復(fù)雜難懂的英文，所以我們要靠快速讀文法，學(xué)會抓重點(diǎn)。

六：考點(diǎn)詳細(xì)讀，非出題點(diǎn)略讀

這句話非常簡單，然而，很多考生往往很難做到這一點(diǎn)，有的考生是不知道什么有用，不知道哪兒是出題點(diǎn)，也就不知道哪里詳讀哪里略讀，只好全文都一樣重點(diǎn)的讀，其實也就等于全文都沒讀好。

GRE閱讀材料：鳥叫的研究

Over the years, biolists have suggested two main pathways by which sexual selection may have shaped the evolution of male birdsong. In the first, male competition and intrasexual selection produce relatively short, simple songs used mainly in territorial behavior. In the second, female choice and intersexual selection produce longer, more complicated songs used mainly in mate attraction; like such visual ornamentation as the peacock’s tail, elaborate vocal characteristics increase the male’s chances of being chosen as a mate, and he thus enjoys more reproductive success than his less ostentatious rivals. The two pathways are not mutually exclusive, and we can expect to find examples that reflect their interaction. Teasing them apart has been an important challenge to evolutionary biolists.

Early research confirmed the role of intrasexual selection. In a variety of experiments in the field, males responded aggressively to recorded songs by exhibiting territorial behavior near the speakers. The breakthrough for research into intersexual selection came in the development of a new technique for investigating female response in the laboratory. When female cowbirds raised in isolation in sound-proof chambers were exposed to recordings of male song, they responded by exhibiting mating behavior. By quantifying the responses, researchers were able to determine what particular features of the song were most important. In further experiments on song sparrows, researchers found that when exposed to a single song type repeated several times or to a repertoire of different song types, females responded more to the latter. The beauty of the experimental design is that it effectively rules out confounding variables; acoustic isolation assures that the female can respond only to the song structure itself.

If intersexual selection operates as theorized, males with more complicated songs should not only attract females more readily but should also enjoy greater reproductive success. At first, however, researchers doing fieldwork with song sparrows found no correlation between larger repertoires and early mating, which has been shown to be one indicator of reproductive success; further, common measures of male quality used to predict reproductive success, such as weight, size, age, and territory, also failed to correlate with song complexity.

The confirmation researchers had been seeking was finally achieved in studies involving two varieties of warblers. Unlike the song sparrow, which repeats one of its several song types in bouts before switching to another, the warbler continuously composes much longer and more variable songs without repetition. For the first time, researchers found a significant correlation between repertoire size and early mating, and they discovered further that repertoire size had a more significant effect than any other measure of male quality on the number of young produced. The evidence suggests that warblers use their extremely elaborate songs primarily to attract females, clearly confirming the effect of intersexual selection on the evolution of birdsong.

17.1. The passage is primarily concerned with

(A) showing that intrasexual selection has a greater effect on birdsong than does intersexual selection

(B) contrasting the role of song complexity in several species of birds

(C) describing research confirming the suspected relationship between intersexual selection and the complexity of birdsong

(D) demonstrating the superiority of laboratory work over field studies in evolutionary bioly

(E) illustrating the effectiveness of a particular approach to experimental design in evolutionary bioly

17.2. The author mentions the peacock’s tail in line 8 most probably in order to

(A) cite an exception to the theory of the relationship between intrasexual selection and male competition

(B) illustrate the importance of both of the pathways that shaped the evolution of birdsong

(C) draw a distinction between competing theories of intersexual selection

(D) give an example of a feature that may have evolved through intersexual selection by female choice

(E) refute a commonly held assumption about the role of song in mate attraction

17.3. According to the passage, which of the following is specifically related to intrasexual selection?

(A) Female choice

(B) Territorial behavior

(C) Complex song types

(D) Large song repertoires

(E) Visual ornamentation

17.4. Which of the following, if true, would most clearly demonstrate the interaction mentioned in lines 11-13?

(A) Female larks respond similarly both to short, simple songs and to longer, more complicated songs.

(B) Male canaries use visual ornamentation as well as elaborate song repertoires for mate attraction.

(C) Both male and female blackbirds develop elaborate visual and vocal characteristics.

(D) Male jays use songs to compete among themselves and to attract females.

(E) Male robins with elaborate visual ornamentation have as much reproductive success as rivals with elaborate vocal characteristics.

17.5. The passage indicates that researchers raised female cowbirds in acoustic isolation in order to

(A) eliminate confounding variables

(B) approximate field conditions

(C) measure reproductive success

(D) quantify repertoire complexity

(E) prevent early mating

17.6. According to the passage, the song sparrow is unlike the warbler in that the song sparrow

(A) uses songs mainly in territorial behavior

(B) continuously composes long and complex songs

(C) has a much larger song repertoire

(D) repeats one song type before switching to another

(E) responds aggressively to recorded songs

17.7. The passage suggests that the song sparrow experiments mentioned in lines 37-43 failed to confirm the role of intersexual selection because

(A) females were allowed to respond only to the song structure

(B) song sparrows are unlike other species of birds

(C) the experiments provided no evidence that elaborate songs increased male reproductive success

(D) the experiments included the songs of only a small number of different song sparrows

(E) the experiments duplicated some of the limitations of previous field studies