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【单选题】
下列不属于黑色金属的是 _______ 。A.
铸铁
B.
钢
C.
青铜
D.
合金钢
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反馈参考答案：
举一反三
【简答题】Both communities have a tradition of keeping history ________.
【判断题】Local communities employ both knowledge and resources to pr desertification.
A.
正确
B.
错误
【单选题】What are the similar key elements of both the human communities and the communities of animal world?
A.
Roles of individual members and rules to make sure the community functions in an orderly way.
B.
Roles of the group leader and protection from the group leader.
C.
Roles of community members and functions of group leader.
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