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  3. A bird flu, a massive earthquake, a monster storm and a terrorist attack are all

A bird flu, a massive earthquake, a monster storm and a terrorist attack are all

游客2023-09-01  7
问题 A bird flu, a massive earthquake, a monster storm and a terrorist attack are all threats to major cities in the U.S. [br] Incompatible communications is a country-wide problem in the U.S. because of the ______ which should be converted or replaced.
选项
答案 decades-old radio systems。
解析 根据题干中的信息词incompatible communications和converted 定位到第三个小标题下的第一段，可知通信不畅是全国(美国)性的问题，而修整或更换已使用数十年的无线电系统既费时又费钱，由此推断，通信不畅的原因是无线电系统年久失修，因此可得答案。
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