In the movie 2012，the volcano （火山） in Yellowstone National Park erupts（爆发），smoke flies thousands of meters into the air，and car-sized pieces of stone and ash （灰烬） fly out．
Now，some scientists say，it's very possible that the Yellowstone volcano will soon erupt in real life for the fourth time in history，after about 640，000years．It is said that the volcano in the Yellowstone National Park，Wyoming，US，has been rising since 2004．Its magma（岩浆） surface has gone up 3inches per year over the last three years alone．This rise is one of the key signs that a volcano is about to erupt． However，scientists are not sure when the eruption will happen or what it will cause．
Unlike what happens in 2012，a volcano eruption would not destroy the whole world，but it could cause huge damage to people living nearby．
The famous eruption of Vesuvius in 79AD destroyed the ancient Roman city of Pompeii．The 2010eruption of the Iceland Volcano caused more than 800people to lose their homes and many airports in European countries to shut down for a few days．
There are more than 1，500active volcanoes in the world．A volcano is considered active if it has erupted in the last 10，000years．
In ancient times，more than 80percent of the earth's surface was volcanic．Volcanic eruptions formed the sea floor and some mountains over many years．Gas from volcanoes formed the earth's atmosphere（大气层）．
Volcanoes come from very hot liquid（液体） rock，called magma，inside the earth．When magma comes upward and breaks through the earth's surface，it forms volcanoes．
52．The writer says something about the movie 2012in Paragraph 1to___．
A．remind readers that 2012is coming
B．advertise this famous movie
C．attract readers'interest in the movie
D．introduce the topic of volcanoes
53．According to Paragraph 2，a volcano will probably erupt if___．
A．it has a history of about 640，000years
B．its floor has been