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, changes in the measured strain across a fault zone, and variations in 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 measurements of the strain across a fault zone, and variations among the electrical properties of underground rocks.