GED考試是美國高中同等學(xué)歷考試，主要針對沒有完成高中學(xué)業(yè)的人設(shè)置的，通過GED考試就能證明自己擁有高中學(xué)歷。GED考試主要考察科學(xué)、數(shù)學(xué)，社會學(xué)科、英語(閱讀和寫作)等內(nèi)容，每部分分?jǐn)?shù)在100到200分之間，最低及格分?jǐn)?shù)為145分。

GED科學(xué)考試主要評估學(xué)生理解、解釋和應(yīng)用科學(xué)信息的能力，考試時長90分鐘，共34個問題，題型包括多項(xiàng)選擇、下拉菜單、拖放題、填空題、熱點(diǎn)題、簡答題等等。問題基于閱讀文章、圖表、表格、圖形，地圖等。

備考GED科學(xué)考試，做習(xí)題是非常有幫助的，可以很明確的了解出題的規(guī)律，積累遇到的各種問題的經(jīng)驗(yàn)。下面留求藝留學(xué)也為大家總結(jié)了GED科學(xué)考試內(nèi)容及真題答案講解，來看看這些題目你都會做嗎？

1、生命科學(xué)(40%，大約40個問題中的16個)

生命科學(xué)包括:

人體與健康 ；

生命和能量(如食物和熱量、光合作用) ；

生態(tài)系統(tǒng)中的能量流動(如食物鏈、捕食者和獵物) ；

生命的組織(如細(xì)胞、器官、身體系統(tǒng)) ；

遺傳的分子基礎(chǔ)(如DNA和遺傳學(xué)) ；

演變；

題目：

A scientist collected the following data about the trees growing in a forest over 10 years.

Which is the best conclusion the scientist can make about the change in the forest?

The number of pine and fir trees doubled in ten years.

The forest’s climate is changing to become colder, so that oak trees do not grow as well.

The number of evergreen trees increased, while the number of oak trees decreased.

The forest is getting more rainfall, which is causing the overall amount of trees to increase.

答案：The number of evergreen trees increased, while the number of oak trees decreased.

2、物理科學(xué)(40%，約40題中的16題)

GED考試中的物理科學(xué)可以涵蓋以下任何主題:

熱量、溫度以及熱量的流動和傳遞；

產(chǎn)生或利用熱量的化學(xué)反應(yīng)和生命過程；

能量的類型和能量的轉(zhuǎn)化；

能源，如太陽或燃料；

波浪和光；

速度、速率、加速度、動量和碰撞；

力和重力；

物質(zhì)的結(jié)構(gòu)，包括原子和分子；

物質(zhì)的屬性，如狀態(tài)(液體、氣體)和密度；

化學(xué)和化學(xué)方程式；

溶液，例如將鹽溶解在水中；

題目：

In a chemical equation, there should be the same number of atoms on each side. Choose the correct answer to complete the equation, which shows that combining methane plus oxygen creates carbon dioxide and water. CH4 + ________O2 → CO2 + 2H2O

Choices：2，3，4，5

答案：2

3、地球和空間科學(xué)(20%，大約40個問題中的16個)

地球和空間科學(xué)問題可包括以下任何主題的信息:

地球上生物和非生物之間的相互作用，如碳循環(huán)、水循環(huán)或化石燃料；

暴風(fēng)雨或地震等自然災(zāi)害；

水、燃料、土地和食物等自然資源；

大氣和海洋；

地球的系統(tǒng)，如侵蝕 地球的結(jié)構(gòu)，如地核、地幔和地殼 宇宙、星系、恒星和太陽系；

太陽、行星、彗星、小行星和衛(wèi)星，包括地球和太陽系的運(yùn)動；

地球的年齡，包括化石、地貌和測定地球巖石的年代；

題目：

What Is Mercury Like? ?The surface of Mercury looks much like Earth's moon, and it is marked with many impact craters. Mercury has almost no atmosphere. Because it is so close to the sun, it can be extremely hot. For example, on its sunny side, Mercury can reach a scorching 800 degrees Fahrenheit. (However, Mercury is not the hottest planet in the solar system—Venus is the hottest planet.) On its dark side, Mercury gets extremely cold because it has almost no atmosphere to hold in heat and keep the surface warm. The temperature can drop down to minus 300 degrees Fahrenheit. Sunlight never reaches into the bottoms of some craters near Mercury's poles, which could mean that ice may be inside those craters, where there would be constant freezing temperatures. ?How Has NASA Studied Mercury? ?Because it is so close to the sun, Mercury is difficult to study from Earth. No humans have ever traveled to Mercury, but the first robotic spacecraft to visit Mercury was Mariner 10. It flew by Mercury in 1974 and 1975. Mariner 10 was able to take pictures of less than half of Mercury's surface. Following Mariner 10, no spacecraft visited Mercury for more than 30 years. Then NASA's MESSENGER flew by Mercury in 2008 and 2009. On March 17, 2011, it began its orbit of Mercury. MESSENGER will map Mercury by taking pictures of the planet's surface, including some areas that have not been seen before. It will also collect data on the composition of the surface rocks, and measure the heights of mountains and depths of craters and valleys. Some data collected by MESSENGER will help scientists to understand what the inside of Mercury is like. MESSENGER will let people learn more about Mercury than they ever have before. ?Source: Adapted from “What Is the Planet Mercury?” by David Hitt, March 30, 2011.

based on the article, which piece of information do scientists NOT know about Mercury?

Whether asteroids or other objects from space have crashed into Mercury’s surface；

The effects of Mercury’s atmosphere on its temperature；

The structure of the center of Mercury；

The temperature range on the surface of Mercury；

答案：The structure of the center of Mercury.

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