英语选词填空10空求帮忙sources; because; war; satellites; first; of; ignored; even; which; occasionally; found; but; astronomers; transmission; with There had been formal agreements to reserve at least some radio frequencies for astronomy.Bu

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英语选词填空10空求帮忙
sources; because; war; satellites; first; of; ignored; even; which; occasionally; found; but; astronomers; transmission; with
There had been formal agreements to reserve at least some radio frequencies for astronomy.But precisely [181] these frequencies represented a clear channel,the military [182] found it necessary to use them.If the third world [183] ever came,perhaps the radio astronomy would be the [184] to know,their windows to the sky overflowing [185] orders to battle -- management and damage -- assessment satellites in orbit,and with the [186] of coded launch commands to distant points.[187] with no military traffic,in listening to a billion frequencies at once the [188] had to expect some interference.Lightening,automobile engines,direct broadcast satellites were all [189] of radio interference.But the computers had their number,knew their characteristics and systematically [190] them.To signals that were less clear the computer would listen with greater care and make sure they matched no collection of data it was programmed to understand.

181 because
182 occasionally
183 war
184 first
185 satellites
186:transmisssion
187 even
188.astronomers
189 sources
190 ignored
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