A scientific report has found that snow and ice on Africa’s highest mountain Kilimanjaro ______rapidly and could vanish within 20 years.   


  1. A.
    has been melted
  2. B.
    will melt
  3. C.
    is melting
  4. D.
    was being melted
C
試題分析：句意：一份科學報告表明：非洲最高的山脈乞力馬扎羅山上的積雪和冰層正在快速融化，并可能在未來20年內(nèi)徹底消失。表示現(xiàn)在正在進行的動作，故用現(xiàn)在進行時。
考點：時態(tài)考查題
點評：這種用法往往表示發(fā)生在過去，說話時沒完成，仍在繼續(xù)進行的動作或狀態(tài)。做題時可以從上下文推斷應選用的時態(tài)。主句用了現(xiàn)在完成時，從句中不會用過去進行時，從句中后半句中用了將來時，那么前半句就應該比將來時早一步，即“現(xiàn)在”，選項中A是現(xiàn)在完成時，C是現(xiàn)在進行時，根據(jù)主語和動詞的關(guān)系可以排除A。
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