题目选项分析

In preparing for a major earthquake that is predicted to hit the state, the California Office of Emergency Services is building a satellite-based computer network to identify earthquake damage and to pinpoint the most affected areas within two hours of the event.

To prepare for the prediction of a major earthquake hitting the state, a satellite-based computer network is being built by the California Office of Emergency Services to identify earthquake damage and to pinpoint the most affected areas within two hours of the event.