Now,lookatthepicturesofTangshanandSanFranciscoinwarmingupanddescribewhatyouseeinthepictures.
(
beautifulcities;
broadroads;
tallbuilding;
largepopulation.)
Whatwillhappeniftherehasbeenabigearthquakeinthesetwocities?
Asweallknow,
earthquakesaredisasterstoeveryone.
Butcanweavoidoratleastreducethelosscausedbyearthquakes?
Canweforetellearthquakes?
Nowlet&
rsquo;
scometoPre-
readinganddecidewhatmayhappenbeforeanearthquakecomes.