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單項(xiàng)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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單項(xiàng)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

單項(xiàng)選擇題

Knowledge（）human beings into civilization.

A.channels
B.adapts
C.turns
D.takes