第3题: [单项选择]The book gives a brief ________ of the course of his research up till now. A. outline B. reference C. frame D. outlook 参考答案:A 答案解析:[解析] 近形近义题；所填词被brief修饰，并和research有关，[A] outline“大纲，要点，概要”，符合句意，所以[A]为答案。[B]reference“参考”和brief不搭配；[C
第22题: [单项选择]The African way of communication sent messages ______. A. in a special way B. over a very short distance C. by a musical instrument D. at a rather slow speed 参考答案:C 答案解析:[解析] 第三段提到非洲人通过击鼓来传达信息。鼓为一种乐器，所以答案为C。
