Years ago, many of the machines were operated ______ but now they are operated b

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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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