通常我们把能够（）的物质称为流体。 ["变化","流动","膨胀","收缩"]
有目的有计划地对被评者行为进行现场观察或测量，并对观测结果作出评定的方式是（）。 ["观察法","测量法","自然观察法","自然测量法"]
国际航空运输协会（IATA）日前发布数据，称2016年航空业净利润预计将达356亿美元。数据显示，2016年将是航空业利润创纪录的一年，净利润率约（）。 ["3%","5%","7%","9%"]
根据写作要求，写出一篇作文。 Suppose you are Simon. You purchased a Sony digital camera from Amazon.com and found that there were scratches on the screen. You are writing to complain about it.
土的毛细现象
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