______commutation via the telegraph began in the 1840s, just before the Civil War, and via flic telephone just afterward(1870s).

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问题 ______commutation via the telegraph began in the 1840s, just before the Civil War, and via flic telephone just afterward(1870s). (2009年北京大学考博试题)

选项 A、Instantaneous
B、Spontaneous
C、Simultaneous
D、Instinctive

答案A

解析 instantaneous意为“瞬间的,即时的”, spontaneous意为“自发的”,simultaneous意为“同时发生的”,instinctive意为“本能的,天生的”。电报和电话都是即时的通信工具,故正确答案为A。
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