“要”的汉语拼音是yao，这个音节的韵母中的韵头是i。
天然气主要成分（）。 ["甲烷","乙烷","丙烷","丁烷"]
柴油机缸套吊出检修时，对水则应（） ["用酸清洗","用碱清洗","用柴油清洗","除垢"]
反应器脱氢操作后，需对循环气样分析（）含量 ["氧含量","氢纯度","氮气量","烃＋氢"]
William Rufus(William II)was killed by an arrow when he was hunting in（）in August l100. ["the New Forest","Pevensey","Winchester","Gloucester"]
比较世界旅游地理学的发展同中国旅游地理学发展的特点。
