题型：单选题 难度：★★★★ 
12.4万热度
many modern plays, the author finds, frequently contain speech which __
a．is incoherent and linguistically objectionable
b．is far too ungrammatical for most people to follow
c．unintentionally shocks the audience
d．tries to hide the author's intellectual inadequacies
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if you have active thoughts, your audience will detect that
a．you are full of fear and depression
b．you are joyful and easy-going
c．you are tightening your vital triangle
d．you are relaxing your muscles
in what way can natural pollutants play an important role in controlling air pollution
a．they function as part of a purification process.
b．they are dwarfed by the pollutants produced by human activities.
c．they are less harmful to living beings than are other pollutants.
d．they have existed since the earth developed.