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问题: 用cruel的适当形式填空

It’s no excuse to say that dangerous creatures deserve to be treated( ) on account of their own ( ).They are not really( ),for they tear and kill not from love of unkindness,but because they must do so in order to live.

解答:

1. cruelly (这儿需要副词)
2. cruelty (need 名词)
3. cruel (need 形容词)