试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
The machine is activated by a small set of words with every accurately defined meanings. （）
参考答案
正确答案：
试题解析
set to work 开始工作；activate 激活。
这台机器由一小组单词激活，每个单词都有精确定义的含义。