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今天，为大带来了一篇关于雅思阅读题源New Scientist的文章Stone tools helpd shape human hands，供大参考熟悉雅思阅读题源New Scientist的文章风格。

雅思阅读题源New Scientist ：Stone tools helpd shape human hands 原文

AROUND?1.7?million?years?ago,?our?ancestors'?tools?went?from?basic?rock*anged?together?to?chipped?hand?axes.?The?strength?and?dexterity?needed?to?make?and?use?the?latter?quickly?shaped?ourhands?into?what?they?are?today?–?judging?by?a?fossil?that?belongs?to?the?oldest?known?anatomically?modern?hand.

The?1.7-million-year-old?Acheulean?hand?axes?were some?of?the?first?stone?tools.?Over?the?next?million?years,?these?chunky?teardrop-shaped?rocks?became widely?used?before?being?replaced?by?finer,?more?precise?flint?tips.?But?how?our?ancestors'?hands?evolved?into?a shape?that?could?make?such?tools?is?a?bit?of?a?mystery.

Before?the?hand?axes?appeared,?our?ancestors?had?primitive?wrists:?good?for?hanging?from branches,?but?too?weak?to?grasp?and?handle?*all?objects?with?much?force.?And no?hand?bones?had?been?found?to?fill?the?gap?between?1.7?million?years?ago?and800,000?years?ago?–?by?which?time?humans?had?developed?the?hands?we?have?today. Now,?a?new?fossil?is?helping?bridge?that gap.

In?2021,?a?team?led?by?Fredrick?Kyalo?Manthi?of?the National?Museums?of?Kenya?discovered?an?intriguing bone?in?the?north?of?the?country.?Carol?Ward?of?the?University?of?Missouri?and colleagues?identified?it?as?a?third?metacarpal, the?long?bone?in?the?palm?between?the?middle?finger?and?the?wrist.
Like?modern?human?metacarpals,?it?has?a?*all?lumpat?its?base?–?the?styloid.?This projection?helps?stabilise?the?wrist?when?the?hand?is?gripping?*all?objects between?the?thumb?and?fingers.?Isotopedating?revealed?the?bone?to?be?about?1.4?million?years?old.?It?is?likely?to have?belonged?to?Homo?erectus.

Hand?bones?of?early?Homo?erectus?are?almost?unknown, says?Richard?Potts?of?the?Smithsonian?Institution?in?Washington,?DC." Having?such?a
well-preserved?specimen?begins?to?answer?questions?abou thand?evolution,"?he?says.

"This?is?an?exciting?find,"?agrees?Mary Marzke?of?Arizona?State?University?in?Tempe.?It?shows?that?our?ancestors'?handswere?already?evolving?into?their?modern?form?1.4?million?years?ago.?The forceful,?repetitive?and?sustained?processes?of?tool?use,?such?as?digging?with rocks,?would?have?made?stronger?hands?desirable,?says?Marzke.

This?would?have?been?particularly?useful?for knocking?off?flakes?to?form?and?sharpen?hand?axes,?says?Potts.?Once?the important?wrist?features?were?in?place,?it?became?easier?for?later?hominids?to?make?*aller,?finer?tools.

Because?the?fossil?is?younger?than?the?first?tools, Ward's?team?believe?it?is?the?first?evidence?of?anatomy?evolving?to?suit?a?new?technology.?As?stone?tools?became more?widespread,?those?who?had?the?wrist?structure?to?use?them?would?have?had an?evolutionary?advantage?over?their?weaker-wristed?kin.?"The?way?we?look?today?has?been?shaped?by?our?be haviour over?millions?of?years,"?says?Ward.?She?presented?the?research?at?this week's?meeting?of?the?American?Association?of?Physical?Anthropologists?in Knoxville,?Tennessee.

雅?思?阅?读题?源?N?e?w? ?S?c?i?e?n?t?i?s?t?： Stone tools?helped?shape?human?hands 之注释：

1.?ancestor?祖先
2.?dexterity?灵巧，敏捷。
例句：
Game?playing demands?strategy,?imagination,?quick?response?times?and?a?high?level?of dexterity.玩游戏要求有策略，有想象力，反应快，动作敏捷。
3.?fossil?化石
4.?chunky?矮胖，粗短。
例句：
And?the?firm, synonymous?with?chunky?gold?jewellery?encrusted?with?gemstones,?expects?its performance?in?2009?to?be?even?worse?than?last?year.
作为镶嵌着宝石的粗重黄金珠宝代名词的这公司，预期2009年业绩将比去年还要糟糕。
5.?flint?打火石

6.?primitive wrist?原始的手腕。
Primary主要的，基本的，基础的，衍生词
primitive是原始的。
7.?bridge the?gap?填补空白。
8.?intriguing?有趣的，迷人的。
例句：
The?intriguing book?is?both?thoughtful?and?informative.这本引人入胜的书既有思想性又富知识性。
9.?metacarpal?掌骨
10.?Isotopedating?同位素鉴定。Date有鉴定年代的意思。
11.?homo?erectus?直立人
12.?hominid?人种
13.?anatomy?解剖学
14.?kin?亲戚，同族

以上，即是本次为大搜集的雅思阅读题源New Scientist的文章Stone tools helpd shape human hands，供大参考熟悉雅思阅读题源New Scientist的文章风格。希望大在平日里，也多多关注我们推荐的雅思阅读题源的文章（详情请点击查看 ）。更多精彩文章，尽在！