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能源、环境问题是全球关注的热点问题． （1）现阶段，人们主要利用煤、______和______等化石燃料产生的能量． （2）“蜂窝煤”被加工成多孔形状的原因是______． （3）火箭用联氨（N 2 H 4 ）做燃料，用四氧化二氮（N 2 O 4 ）助燃，生成物不会对大气造成污染．完成其燃烧反应的化学方程式：2N 2 H 4 +N 2 O 4 =3N 2 +______． （4）“转变传统观念，推行低碳生活”的主题旨在倡导节约能源和利用清洁能源，减少温室气体二氧化碳的排放．下列措施①不必要的衣物；②减少使用私家车次数、多乘公交车或骑自行车；③废旧电池回收再利用；④开发新能源如太阳能；⑤焚烧废旧塑料解决“白色污染”，符合该主题的是______（填数字序号）．
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【单选题】Unlike the origins of most nations, America’s origins are not ______ in the mists of time.
A.
far away
B.
taken after
C.
obscured
D.
viewed
【简答题】On the origins of racism 1_____ over the origins of racism often suffer from a lack of clarity over the term. Many mix recent forms of racism with earlier forms of 2_____ and national conflict. In mos...
【判断题】The origins of etiquette—the conventional rules of behavior. and ceremonies observed in polite society—are complex. One of them is respect for authority. From the most primitive times, subjects(臣民) sh...
A.
正确
B.
错误
【单选题】The Origins of Theater In seeking to describe the origins of theater, one must rely primarily on speculation, since there is little concrete evidence on which to draw. The most widely accepted theory,...
A.
changed
B.
debated
C.
created
D.
supported
【判断题】The theories about the origins of language are not at most a speculation.
A.
正确
B.
错误
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