49. How are volcanoes different from other natural disasters?
(A) They give a warning before eruption.
(B) They are less disastrous.
(C) More people die from volcanoes.
(D) They happen abruptly.

Volcanoes also tend to give notice that something is about to happen—Kilauea’s small earthquakes, increasing amounts of lava at the summit, and a change in the slope of the volcano all indicated in recent weeks that an eruption may happen soon. This isn’t necessarily the case in other parts of the world, where earthquakes, tornadoes, fires, and floods can spring up without warning. 

火山也往往會發出即將發生的事情的通知——基拉韋厄的小地震、山頂熔岩量的增加以及火山坡度的變化都表明最近幾周可能會發生噴發。在世界其他地方，情況不一定如此，在那里地震、龍捲風、火災和洪水可能會在沒有警告的情況下突然出現。

(A) 它們在噴發前發出警告。 (B) 它們的災難性較小。 (C) 更多的人死於火山。 (D) 它們突然發生。