单项选择题

The early warning systems developed in the 1990's are used to

A．improve estimates of long-term earthquake probabilities.
B．tell people in the epicenter when the earthquake will come.
C．allow evacuation from the region that the earthquake will hit.
D．prepare people for earthquakes several minutes in advance.

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单项选择题

After the Parkfield programme, experts concluded that earthquake prediction in terms of days and years was

A．chancy.
B．hopeful.
C．unrealistic.
D．difficult.

单项选择题

The ambitious Parkfield programme was successful at least in one of the following aspects:

A．Scientists will be fully prepared with equipment to collect more information if an earthquake occurs.
B．It enabled scientists to predict an impending earthquake on time scales of hours to days.
C．A moderate earthquake did occur in the region sometime between 1985 and 1993 just as predicted.
D．People in the Parkfield region were less panic but more prepared for any coming earthquakes.