A spaceship flies at about eleven kilometers ________ second．


  1. A.
    /
  2. B.
    the
  3. C.
    a
  4. D.
    an
C
解析：
這里用不定冠詞a/an來表示“每一”的意思．因?yàn)閟econd是以輔音音素開頭的單詞．
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