单项选择题
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
If you want to be a friend of your roommates, which of the following may mostly help you(). A. By living together for one year.
B. By not rooming together.
C. By sharing habits with each other.
D. By not disturbing each other.