2. 外语
  3. Years ago, many of the machines were operated ______ but now they are operated by computers.

Years ago, many of the machines were operated ______ but now they are operated by computers.

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问题 Years ago, many of the machines were operated ______ but now they are operated by computers.
选项 A、manually
B、artificially
C、automatically
D、synthetically
答案A
解析 难词辨析，原句意为：许多年以前，大部分机器都靠人工操作而现在都由计算机控制了，A. manually意为“用手工操作，人工地”，正好与by computers意义相对，符合题干要求。B. artificially意为“人造地”；C. automatically意为“自动地”，D. synthetically意为“合成地，人造地”，
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