A．construct strong buildings
B．put forward proposals
C．detect disastrous earthquakes
D．monitor earthquakes

A．notice them out at sea
B．find ways to stop them
C．be warned early enough
D．develop warning systems

A．Tsunami has nothing to do with tides．
B．Tsunamis travel fairly slowly only in harbors．
C．Tsunami may pile up into high walls of water in harbors．
D．Seismic sea waves can be caused by submarine earthquakes．