______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
試題分析：通過(guò)分析句子結(jié)構(gòu)，可知句子的真正主語(yǔ)是that引導(dǎo)的主語(yǔ)從句，這里需要形式主語(yǔ)，故用it。
考點(diǎn)：it作形式主語(yǔ)
點(diǎn)評(píng)：動(dòng)詞不定式，動(dòng)名詞或主語(yǔ)從句作主語(yǔ)時(shí)，通常把它們放在謂語(yǔ)動(dòng)詞前，而用it作形式主語(yǔ)，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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C．Exploring the Possibility to Clone Pandas
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