Scientific research shows that animals can show         emotions like human beings. They are sometimes lively, and sometimes bad-tempered.
A．contradictoryB．instantC．a(chǎn)ppropriateD．flexible
D

試題分析：考查形容詞。A．contradictory矛盾的；B．instant立即的；C．a(chǎn)ppropriate適當(dāng)?shù)�；D．flexible靈活的。句意：科學(xué)研究表明，動物可以顯示像人類一樣靈活的情感。它們有時活潑，有時壞脾氣。故D正確。
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