單項選擇題When intruded, a territorial animal will only perform some hostile（）to warn off the intruder.
A.behaviors
B.actions
C.signs
D.gestures
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1.單項選擇題But it is evidently bored and frustrated（）company.
A.speaking of
B.for lack of
C.in honor of
D.in the presence of
2.單項選擇題Knowledge（）human beings into civilization.
A.channels
B.adapts
C.turns
D.takes
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