【单选题】Emotions are significant for man ' s survival and adaptation because ______.
A.
they provide the means by which people view the size or shape of objects
B.
they are the basis for the social feeling of agreement by which society is maintained
C.
they encourage people to perform. dangerous achievements
D.
they generate more love than hate among people
【单选题】. The organization’s _____ are to provide food for homeless people and help them find somewhere to live.
【多选题】我国大气污染以煤烟型污染为主,主要污染物为( )
【简答题】我国城市大气污染是以()和()为主要污染物的煤烟型污染。
【单选题】We should consider the professor’s advice _______ our school library provide more books on popular science.
【简答题】*氯丙嗪可抑制延髓催吐化学感受区的________受体,大剂量时能直接抑制__________,所以镇吐作用很__________,但对于___________引起的呕吐无效。
【多选题】我国的大气污染主要是煤烟型污染,所以防治燃煤产生的烟尘、二氧化硫等污染物一直是我国大气污染防治的重要内容,其主要措施包括( )。
【简答题】我国的大气污染以煤烟型为主, 和 是主要污染物。
【单选题】我国大气污染严重,其主要类型仍是以下列那种为特征?( )