填空题

在20 世纪初, there were four powerful means of transmitting and receiving information.

【参考答案】

At the beginning of the 20th century

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填空题

Several small earthquakes were predicted in New York State, in the______(east) part of the U. S. A.

填空题

与此同时, even those of us who are not scientists have begun to pay attention to air.