单项选择题

To the forecasters, the troublesome problem is _________.

A．it's hard to tell disastrous submarine earthquake
B．people don't take much notice of their warning
C．tsunamis are rare
D．where to get money for the false alarms

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单项选择题

Which of the following is true according to the passage

A．Big waves depend on the intensity of earthquake.
B．Most earthquakes that cause tsunamis happen in the Pacific.
C．Tsunamis often occur along the coast of Indonesia.
D．Trenches at the bottom of the sea create tsunamis.