________ most wolves rely on their groups for food, shelter and companionship, they have developed a system of signals to keep the groups together.


  1. A.
    Because
  2. B.
    Although
  3. C.
    Unless
  4. D.
    Where
A
句意：由于大多數(shù)狼都靠它們的組群來獲得食物、庇護所以及伙伴，因此它們有一整套的信號可以使得整個組群在一起。本題考查狀語從句用法，根據(jù)上下句之間的邏輯關(guān)系，可知兩句話之間存在邏輯上的因果關(guān)系，故A項正確。
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