【题目】At the conference , political leaders from many countries promised to work together to defend the world ________ terrorism and other threats.
A. for B. without
C. against D. beyond
在线课程【答案】C
【解析】句意：在会议室，来自各个国家的政治领导许诺一起工作保护这个世界免于恐怖主义和其他威胁。defend...against...意为“防卫…以免于”。所以选C。