首页
登录
职称英语
One way to determine which planets outside the solar system might harbor lif
One way to determine which planets outside the solar system might harbor lif
游客
2024-01-10
16
管理
问题
One way to determine which planets outside the solar system might harbor life is to look for telltale signs in their light. Living organisms create a chemical disequilibrium in their environment, typically indicated by a molecule whose presence can be explained only if some presence is continually regenerating it. For example,
Earth’s atmosphere contains oxygen
because photosynthesis produces it faster than it is lost through processes such as the rusting of iron in rocks. However, chemical disequilibrium does not necessarily indicate the presence of life because, as in the case of methane on Mars, the imbalance could arise through nonbiological processes. [br] The passage mentions that “Earth’s atmosphere contains oxygen” primarily in order to
选项
A、contribute to a discussion of the nature of photosynthesis
B、give an example of a chemical disequilibrium
C、identify an element that scientists are looking for on Mars
D、illustrate a process that occurs only on Earth
E、introduce a contrast between oxygen and methane Consider each of the choices separately and select all that apply.
答案
B
解析
本题属于目的题,定位句是第三句,很明显是例子,用来介绍前文捉及的化学失衡,所以选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3349323.html
相关试题推荐
Virtuallyeverythingastronomersknownaboutobjectsoutsidethesolarsyste
Virtuallyeverythingastronomersknownaboutobjectsoutsidethesolarsyste
Virtuallyeverythingastronomersknownaboutobjectsoutsidethesolarsyste
Virtuallyeverythingastronomersknownaboutobjectsoutsidethesolarsyste
Virtuallyeverythingastronomersknownaboutobjectsoutsidethesolarsyste
Thevalueofaproductisdeterminedbytheratioofitsqualitytoitsprice.T
Themindandtheimmunesystemhavebeenshowntobeintimatelylinked,andscie
ArecentreportdeterminedthatalthoughonlythreepercentofdriversonMaryla
Aresearcherdiscoveredthatpeoplewhohavelowlevelsofimmune-systemactivit
Aresearcherdiscoveredthatpeoplewhohavelowlevelsofimmune-systemactivit
随机试题
A—CertificateofHealthB—FireInsuranceC—IndustrialAccidentsD—InsuranceComp
TomSmithwasawriter.Hewrotestoriesformagazines.Oneeveninghecould
客户端通过()协议发送电子邮件。A.FTP B.SMTP C.HTTP D
脾虚夹积型积滞证见面色萎黄,其病因是A.气血运行不畅 B.脾胃虚弱,湿邪内生
我国《宪法》第二条明确规定:“人民行使国家权力的机关是全国人民代表大会和地方各级
甲投资公司(以下简称甲公司)与乙国有企业(以下简称乙企业)以甲公司出资金乙企业提
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
下列不属于建设项目环境影响报告表填报内容的是( )。A.建设项目的基本情况
矿业工程项目建设具有其自身的一系列特点,这些特点往往也是引起索赔的因素,通常矿业
依据《通用安装工程工程量计算规范》(GB50856—2013)的规定,高压管道检
最新回复
(
0
)