峡湾景观是斯堪的纳维亚半岛著名的旅游资源，其成因是（    ）

地球的特殊性主要存于它是一颗属于生物繁衍的行星，地球有比较安全的宇宙环境，它与太阳的距离适中，自身的体积和质最也适中，经过漫长的演化，形成了以氮、氧为主的适合生物呼吸的大气，故地球上出现了生命．地球到目前为止唯一被证明存在生命物质的行星，从这一点来说，地球具有与众不同的特殊性．按所给内容之间的关系，把题中所给字母代号填入下面的方框里．

A．地球处在比较稳定的宁市环境中；

B．有适宜的温度

C．体积、质量适中

D．原始海洋形成

E．日地距离适中

F．有适合生物呼吸的大气

G．地球处在比较安全的宇宙环境中

H．地球内部的物质运动加速了水汽的外逸

根据短文内容，选择最佳答案。
B
    Hello! My name is Kate. This is my bag. It's a nice bag, right? It is from my mother.
    What's in my bag? A ruler is in it. And the ruler is white. It's not mine. It's Lily's. Lily is my sister. She likes white but I don't. Two pencils are in it, too. One is red and the other is blue. They are mine. Look, a nice watch is in it. The watch is white and blue. It's mine and it's from my father. A notebook is in my bag, too. The notebook is yellow and blue. Is this notebook mine? No, it's Anna's. Anna is my cousin. She likes yellow and blue very much.

请在横线上填写除杂试剂，并写出相关的离子方程式

 下列实验装置常用于制取和收集气体．

请回答下列问题：