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The Roman Colosseum is a giant amphitheater built two thousand years ago.Despite its age and an earthquake that knocked down its south side,most of the 150-some-foot building is still standing.Like many ancient Roman structures,parts of it were constructed using a specific type of concrete.Scientists and engineers have long suspected the key to these buildings' strength is their use of this Roman concrete .But exactly how this strong concrete has contributed to the architecture's durability(耐用)has been a mystery to researchers worldwide.
    A team of interdisciplinary(跨學科的)researchers recently discovered a potential answer to why these ancient Roman buildings have been able to weather the test of time while many modern,concrete structures seem to collapse after a few decades.The answer:self-healing concrete.The material has three components:limestone.volcanic material and water.For years,architects and historians have guessed the volcanic material is what makes it strong- which it does.But it does not explain the material' s self-healing ability.
    What the researchers found was that the self-healing properties might simply be a result of chemistry.The limestone in the concrete is likely the secret.When the ancient Romans made mortar (砂漿),they heated up the lime to turn it into a substance called"quicklime"—a very reactive chemical sibling to limestone.And,because they introduced water to the quicklime during mixing,the heat it produced set up a chemical foundation that could strengthen the concrete later.When tiny cracks start to form later,the quicklime stops them from becoming bigger.When it rains,the lime quickly fills the crack or reacts with the volcanic ash to "heal" the material.
    For materials scientist Ainissa Ramirez,this new understanding of ancient Roman concrete is a welcome discovery. "This is one way that the material can be greener,"says Ramirez. "It' s sort of like a message in a bottle.The Romans made the material.We had to kind of figure out how they did it so that we can make better materials -and then in turn ,attend to our environment better."

(1)Why is the Roman Colosseum mentioned in paragraph 1?
D
D

A.To show many wonderful ancient Roman structures.
B.To provide a clue for studying ancient Roman structures.
C.To disc lose to the world the mystery of ancient Roman structures.
D.To start the introduction of the durability of ancient Roman structures.
(2)What does the underlined word"weather" in paragraph 2 mean?
C
C

A.Change.
B.Prove.
C.Stand.
D.Suffer
(3)What might account for the architecture' s self-healing ability?
A
A

A.A material called quicklime.
B.A chemical foundation.
C.The volcanic material.
D.The water in the crack.
(4)What is implied in Ainissa Ramirez' s words?
D
D

A.Roman concrete was made like a message in a bottle.
B.Roman concrete was aimed at protecting the environment.
C.Further study of Roman material will be carried out soon.
D.The way to make Roman material can be practical nowadays.

【考點】說明文;科普知識
【答案】D;C;A;D
【解答】
【點評】
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發(fā)布:2024/7/6 8:0:9組卷:8引用:1難度:0.5
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    發(fā)布:2024/11/7 19:30:1組卷:5引用:7難度:0.5
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    發(fā)布:2024/11/9 20:0:2組卷:22引用:1難度:0.5
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    發(fā)布:2024/11/8 18:30:1組卷:5引用:1難度:0.5
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