题目选项分析

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.

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.