第6题: [单项选择]Human beings are superior to animals that they can use language as a tool of communication. A. in that B. in which C. for that D. for which 参考答案:A 答案解析:连词应用。从意思判断,本题的句子是原因状语从句。在四个选项中只有从属连词“in that”可表示“由于,因为”,如:Criticism and self-criticism is necessary