It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today．


  1. A.
    that
  2. B.
    when
  3. C.
    what
  4. D.
    how
C
該題考查it作形式主語(yǔ)，what引導(dǎo)主語(yǔ)從句的用法.what引導(dǎo)主語(yǔ)從句，有詞匯意義并在主語(yǔ)從句中作主語(yǔ)；that引導(dǎo)主語(yǔ)從句時(shí)只起引導(dǎo)作用，無(wú)詞匯意義，也不能在從句中作任何成分；when表示時(shí)間，在主語(yǔ)從句中作狀語(yǔ)；how表示方式，在主語(yǔ)從句中作方式狀語(yǔ).句意是：今天，什么控制二氧化碳在大氣內(nèi)外流動(dòng)已被人們很好地理解.答案為C.
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