【单选题】
—Youshouldhavethankedherbeforesheleft.—Imeant_______,butwhenIwasleavingIcouldntfindheranywhere.
【单选题】
The United States______ many other industrialized countries,______ major changes over the past 100 years.
①
as well as; has experienced
②
as well as; experienced
③
together with;experienced
④
together with; have experienced
【单选题】
—What’s the matter with the boys?
—They didn’t pass the examination, but they still______.
【单选题】
If the weather is fine, we’ll go. If______,______.
【单选题】
我国控制乙型肝炎传播和流行的关键措施是
【单选题】
哺乳动物的呼吸运动主要依靠肋间肌的收缩,增加胸腔前后经之外;还依靠___________,使得横隔下降,以此扩大胸腔的上下经,随之肺也扩大引入气体进入。
【单选题】
原生动物可分为4个重要的纲,分纲的主要依据是什么?