When delivering a speech you should adjust your language to the age of your audience.A.

问题补充：

When delivering a speech, you should adjust your language to the age of your audience.

A. target

B. entry

C. boundary

D. concept

答案：

(答案→)A. target

B. entry

C. boundary

D. concept

解析：名词作定语辨析。A目标；B进入；C便界；D概念；句意：发表演讲时，你应该调整语言以适应你的目标听众的年龄。