Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
The invention of the silicon chip was a （ ）in the history of the computer. (land, mark)
【正确答案】：LANDMARK
【题目解析】：
本题考查的是常用单词的复合词。
由a可知，空缺处应填名词，land和mark可组成复合词landmark意为“地标，里程碑”，符合题意。
句意：硅芯片的发明是计算机史上的一个里程碑。