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A．mustB．wouldC．daresD．should
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A．ticketsB．moneyC．insuranceD．plane
People often speak of fire as though it were a living creature--It grows, dances, needs oxygen, feeds on whatever it can find, and then dies. And when a forest fire rages out of control, threatening human lives and homes, it must be fought like a "wild animal." The fight is often desperate, since firefighters' best efforts may be dwarfed by the fury of a large fire. But the fire's own traits can be used against it.
The heated air above a fire rises in a pillar of smoke and burnt gases, pulling fresh air in from the sides to replace it. Firefighters use this fact when they "fight fire with fire." They start a fire well in front of the one which they are fighting. Instead of traveling on in front of the huge fire, the smaller fire is pulled back toward it by the updrafts of the larger blaze. As it travels back to meet the large fire, the smaller backfire burns away the fuel that the forest fire needs to survive.
Even when a backfire has been well set, however, the fire may still win the struggle. The wind which the firefighters used to help them may now become their enemy. When the backfire meets the main fire, before both die for lack of fuel, there is tremendous flame, great heat and wild winds. A strong gust may blow the fire into the treetops beyond the area, giving the fire new fuel and a new life.
This passage focuses on ______.
In the last paragraph, the writer again refers to the fire as a living creature by saying
Shoes are outer coverings for the foot. They have soles, and most have heels. The upper part of most shoes extend no higher than the ankle. Boots are footwear that reach beyond the ankle. People wear shoes to protect their feet from harsh weather, sharp objects, and uncomfortable surfaces. Shoes are also an important part of people's clothing. As a result, fashion often determines the style. of shoes that individuals wear. The desire to be fashionable has led to many unusual shoe styles. In the 1300's, many European men wore shoes called crackowes, which had an extremely long toe. From the 1300's to the 1700's, some European women wore shoes with really thick soles causing walking to be virtually impossible without support. Shoes once worn in the Orient were connected to a stilt(高跷) as high as six inches.
Traditionally, most shoes are made of leather. But many other materials are now used. Including canvas, velvet, and synthetic substances such as plastics. Footwear materials and style. vary somewhat, depending on climate, custom, or other differences. Farmers in Netherlands often wear heavy wooden shoes that protect their feet from the damp environment while Japanese wear shoes outside their home but prefer soft slippers at home. In fact, people in some regions often wear foot coverings other than shoes. Some wear sandals during the hot summer and switch to warm boots for the cold winter.
What is the main topic of the passage？
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