• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Methane mystery on Mars:Could it mean life?

    2020-08-15 08:21:06江西贛州三中賴麗霞
    瘋狂英語·新讀寫 2020年7期
    關(guān)鍵詞:三中篇幅贛州

    江西贛州三中 賴麗霞

    題材體裁 篇幅 建議用時(shí)452詞 9分鐘科技探索 新聞報(bào)道

    難詞探意

    1.methane /?meθe?n/ n.甲烷

    2.device /d??va?s/ n.裝置

    3.geological /?d?i???l?d??kl/ adj.地質(zhì)(學(xué))的

    4.microbial /ma??kr??b??l/ adj.微生物的

    The United States space agency, NASA, said its Mars exploration vehicle recently recorded a high level ofmethanegas on the planet.Theis exciting because the presence of methane gas could support the case for life on Mars.

    NASA's Curiosity vehicle recently recorded the largest level of methane ever measured during its seven-year Mars mission.Methane has no color or smell.A special instrument on Curiosity's Mars Science Laboratory recorded the increased gas level.Thedevice, called a laser spectrometer, measures levels of chemical elements and gases in the Martian atmosphere.In addition to methane, the instrument can record levels of water and carbon dioxide.Nearly all the methane gas found in Earth's atmosphere is produced by biological activity.It usually comes from animal and plant life.But it can also be formed bygeologicalprocesses, such as interactions between rocks and water.

    It was not the first time Curiosity has found methane gas in the Martian atmosphere.About a year ago, NASA announced that Curiosity had discovered sharp seasonal increases in the gas.This time,NASA said the measured methane gas level was clearly larger than any others observed in the past.NASA officials even temporarily stopped Curiosity's other activities to investigate further.“It's exciting becausemicrobiallife is an important source of methane on Earth,” NASA said in a statement announcing the discovery.

    However, Curiosity's team carried out a follow-up methane experiment that showed a sharp drop in levels of the gas.The second examination found the level was less than one part per billion by volume.“That number was close to the background levels Curiosity sees all the time,” NASA said.The rise and fall of the methane gas levels left NASA scientists with more questions than answers.The scientists are continuing to study possible causes for the sudden increase.“The methane mystery continues,” said Ashwin Vasavada, Curiosity's project scientist at NASA's Jet Propulsion Laboratory in Pasadena, California.“We're more motivated than ever to keep measuring and put our brains together to figure out how methane behaves in the Martian atmosphere.”

    Curiosity does not have instruments that can exactly identify whether the source of the methane is biological or geological.One leading theory is that methane is being released from underground areas created by possible life forms that disappeared long ago.Even though Mars has no active vol

    canoes, scientists believe it is also possible that methane is being produced by reactions involving carbon materials and water.

    “A clearer understanding of methane levels over time could help scientists determine where they're located on Mars,” NASA said.Scientists hope this understanding will come as Curiosity continues to collect methane data in its search for possible life.

    Reading Check

    1.What does the underlined word “discovery” refer to in paragraph 1? (no more than 7 words)

    2.What can the laser spectrometer do? (no more than 20 words)

    3.What is methane in Earth's atmosphere mainly produced by? (no more than 10 words)

    4.Was it the first time Curiosity has found methane gas in the Martian atmosphere?(no more than 5 words)

    5.What's Ashwin Vasavada? (no more than 5 words)

    Language Study

    Difficult sentence

    One leading theory is that methane is being released from underground areas created by possible life forms that disappeared long ago.

    【翻譯】____________________________________________________________________________

    【點(diǎn)石成金】第一個(gè)that引導(dǎo)表語從句,表語從句中主語為methane,第二個(gè)that引導(dǎo)定語從句,先行詞為life forms。

    猜你喜歡
    三中篇幅贛州
    利用和差調(diào)換數(shù)字
    利用和差調(diào)換數(shù)字
    Britain's“Shark House”
    Creative revisions of Peking Opera
    贛州最最美
    心聲歌刊(2019年4期)2019-09-18 01:15:30
    踐行“真教育”“大教育”的八年蛻變
    ——東鄉(xiāng)三中發(fā)展掠記
    教師博覽(2019年1期)2019-01-28 02:40:54
    贛州就業(yè)扶貧“251”模式成榜樣
    贛州港開通兩趟中歐班列
    贛州:“1+100”為青年辦實(shí)事 做青年貼心人
    寄小讀者的信
    泸溪县| 小金县| 罗定市| 东明县| 兴安盟| 来凤县| 平原县| 江门市| 永定县| 青阳县| 泸溪县| 务川| 罗甸县| 阳江市| 宜兰市| 万盛区| 仙居县| 都安| 通许县| 宁乡县| 华容县| 鹤庆县| 博野县| 双柏县| 台前县| 黄平县| 瑞丽市| 常熟市| 昌平区| 民乐县| 本溪市| 精河县| 大连市| 仙游县| 榕江县| 娄烦县| 平泉县| 临城县| 桃园市| 呼和浩特市| 阿荣旗|