填空题
Many of the at-risk behaviors of HIV and AIDS are actually related to cultural beliefs and （），while shaping by an array of complex social，economic，and political factors.
behavioral norms
问答题 Why are prefixes and suffixes divided according to different criteria？
单项选择题 Which of the following is a good definition？（）
单项选择题 Do you mean to risk（）cold by going out now that it has started pouring with rain？
