I.词语辨析：
1、receive / accept
receive：指客观“收到、获得”，不涉及主观意愿。
e.g. She received many flowers from her students.
I received your letter the day before.
accept：指主观同意“接受”
e.g. Would you accept my apology for my having been rude to you?
He received your present but he didn’t accept it.
2、in / within
in：可解释为“在……内”，也可解释为“在……之外、过……时间”，用于将来时。
e.g. They finished their work in three working days.
He will be back in about a month.
