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更多“strong（）”相关的问题
He is ______ a horse.
A．stronger as
B．as stronger than
C．the strong as
D．stronger than
Our country is getting ______.
A．strong and stronger
B．stronger and strong
C．stronger and stronger
D．strong and strong
Between you and me, that boy of Mary's was______.
A．as fat as strong
B．fatter than stronger
C．more fat than strong
D．not so fat as strong
A.like B.in C.around D.to E.toward
When it comes _____1 gravity,the larger an object is,the stronger its force is.A person creates gravity but not enough to pull objects ____2 him or cause things to go into orbit ___3 him.On the other hand,a planet has enough gravity to pull objects into orbit around it.A star makes enough gravity that it can pull whole solar systems into its orbit,____4 ours.Our sun's gravity is so strong that it keeps an object-Pluto-that is roughly 3.7 billion miles away____5 orbit.
Then the inventor Henry Bessemer discovered that directing a blast of air at melted iron in a furnace would burn out the impurities that made the iron brittle. As the air shot through the furnace, the bubbling metal would erupt in showers of sparks. When the fire cooled, the metal had been changed, or converted to steel. The Bessemer converter made possible the mass production of steel. Now three to five tons of iron could be changed into steel in a matter of minutes.
Just when the demand for more and more steel developed, prospectors discovered huge new deposits of iron ore in the Mesabi Range, a 120 long region in Minnesota near Lake Superior. The Mesabi deposits were so near the surface that they could be mined with steam shovels.
Barges and steamers carried the iron ore through Lake Superior to depots on the southern shores of Lake Michigan and Lake Erie. With dizzying speed Gary, Indiana, and Toledo, Youngstown, and Cleveland, Ohio, became major steel manufacturing centers. Pittsburgh was the greatest steel city of ail.
Steel was the basic building material of the industrial age. Production skyrocketed from seventy seven thousand tons in 1870 to over eleven million tons in 1900.
According to the passage, the railroad industry preferred steel to iron because steel was ______.
A．cheaper and more plentiful
B．lighter and easier to mold
C．cleaner and easier to mine
D．stronger and more durable
