题目选项分析

Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting, and other deformations of the Earth's crust, changing the strain as measured across a fault zone, and variations of the electrical properties of underground rocks.

Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting, and other deformations of the Earth's crust, changes in the measured strain across a fault zone, and variations in the electrical properties of underground rocks.