题目内容

【题目】地球是人类的家园，是太阳系中一颗普通而又特殊的行星。据此回答下题。

【1】地球是太阳系中一颗既普通又特殊的行星，其特殊性主要表现在

A．适合生物生存和繁衍

B．绕日公转与自转的方向都是自西向东

C．表面存在大气层

D．位置适中，体积和质量适中

【2】下列关于地球上存在生命物质的基本条件的叙述，不正确的是

A．充足的水分

B．恰到好处的大气厚度和大气成分

C．稳定的太阳光照和适宜的温度范围

D．地球常遭小行星撞击

【3】太阳能量来源于

A．黑子和耀斑的强烈活动 B．强劲的太阳风

C．内部物质的核聚变反应 D．放射性元素衰变产生的热能

【答案】

【1】A

【2】D

【3】C

【解析】

试题分析：

【1】地球是太阳系中一颗既普通又特殊的行星，其特殊性主要表现在地球是太阳系目前发现的惟一有生命的天体。选A正确。

【2】地球上存在生命物质充足的水分；恰到好处的大气厚度和大气成分，以保护地球表面温度变化不致于太大，还为生物提供可呼吸的大气；稳定的太阳光照和适宜的温度范围，是生命活动的基础；地球不经常遭小行星撞击，否则地球上的生命处在危险中。选D正确。

【3】太阳主要由氢和氦组成，能量来源于太阳内部的核聚变反应。选C正确。

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