Smoke fills the sky．The day is as dark as night．Heat makes it hard to breathe （呼吸）．This is thwart world of a wildfire fighter（消防员）！

Wildfires are a part of nature．But，as one firefighter says．"Fire is not a problem．People living near fire﹣that's the problem．"A wildfire can destroy （毁坏）everything in its way．But there are ways to fight it．

By air Smokejumpers （空降森林灭火员）are often the first firefighters to reach a fire．To get closer，they jump from a plane．They are especially important when the area is difficult to walk to．If smokejumpers can't stop a fire in 24 hours，other firefighters join them．This second group drops water on the fire from an airplane．

On the land

On the ground，firefighters work together to stop the fire．First，one group digs a fire line．This is a long deep ditch （沟）．It is difficult for the fire to cross this line．

Then，while those firefighters dig，others start a backfire （回火）．They burn the dry grass and leaves between the wildfire and the fire line．When the wildfire comes，there is nothing for it to use as fuel ．

Other firefighters cut down dead trees．That way the fire can't move to other trees．Firefighters risk their lives to keep people safe．Their job takes hard work，and it takes courage．

53．The underlined phrase" use as fuel"means 　　．

A．

drop

B．

fire

C．

burn

D．

live

54．When the firefighter says，"Fire is not a problem．People living near fire﹣that's the problem，"what does he mean？ 　　

A．	Fire is natural，but it's dangerous to people living near it．
B．	Fires in forests are not a big problem，but fires in cities are．
C．	Fighting fires should be the job of people living near fires．
D．	Putting out fires in cities is always a problem for firefighters．

55．According to the passage，which of the following statements is wrong？ 　　

A．	Smokejumpers are often the last firefighters to reach a fire．
B．	The firefighters dig a fire line to stop the fire crossing the line．
C．	The firefighters start a backfire by burning the dry grass and leaves．
D．	Some firefighters cut down dead trees so that the fire can't move to other trees．

56．The writer wants to 　　．

A．	explain why fire is not a problem
B．	show us how fires destroy everything
C．	tell us how firefighters fight wildfires
D．	teach us how to be a good firefighter．