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______is estimated that a round-trip to Mars would take more than a year.


  1. A.
    That
  2. B.
    what
  3. C.
    There
  4. D.
    It
D
试题分析:通过分析句子结构,可知句子的真正主语是that引导的主语从句,这里需要形式主语,故用it。
考点:it作形式主语
点评:动词不定式,动名词或主语从句作主语时,通常把它们放在谓语动词前,而用it作形式主语,放到句首。
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With only about 1,000 pandas left in the world, China is desperately trying to clone the animal and save these in a dangerous situation. That's a move similar to what a Texas A & M University researchers have been undertaking for the past five years in a project called "Noah's Ark".
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This week, Chinese scientists said they grew an embryo by introducing cells from a dead female panda into the egg cells of a Japanese white rabbit. They are now trying to implant the embryo into a host animal.
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