Hydrogen and oxygen __________ (結(jié)合) to form water.

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科目：高中英語(yǔ) 來(lái)源：2013-2014學(xué)年陜西省高三上學(xué)期第四次適應(yīng)性訓(xùn)練英語(yǔ)試卷（解析版） 題型：信息匹配

根據(jù)短文內(nèi)容，從下邊的A—F選項(xiàng)中選出能概括每一段主題的最佳選項(xiàng)。選項(xiàng)中有一項(xiàng)為多余選項(xiàng)。

A . The different structure of blue holes.????????

B. Why scientists are interested in blue holes.????????

C. How a blue hole comes into being.

D. Blue holes exploring is becoming popular.

E. Rules to obey when diving into blue holes.

F. The general definition of a blue hole.

1.______________

??? A blue hole is a flooded sea cave with a hole that opens up at the land's surface. These cave systems form in carbonate rock, often on islands. Some blue holes have very special rock formations and water chemistry. Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light. Yet these areas are filled with life forms that have adapted to the extreme conditions.

2.___________

??? Blue holes get their name from the color some have when seen from the air. The color is usually a reflection of the sky on the water. Blue holes are the result of erosion in which water breaks down rock. Rain falling thousands of years ago contained chemicals which slowly wore away at the limestone landmass. These holes later filled with sea water as the sea level changed. The rising and falling of sea levels and the mixture of salt and fresh water further wore away at these cave formations.

3. ____________

??? These flooded cave systems can be found in the ocean, or they can be found inland. Ocean caves are affected by tides, so they always have water movement. But blue holes on land are very still. They have several layers of water, chemicals, and bacteria. The top layer of fresh water comes from rainfall. This layer acts like a cap on top of the layered mixture, and keeps out oxygen from the atmosphere. The fresh water floats on a denser layer of saltwater. Underneath this is a layer of poisonous hydrogen sulfide, produced by bacteria living in the water. Underneath this layer is anoxic seawater -- water that does not contain any oxygen.

4.___________

??? Information gathered from these blue holes is helping scientists to increase their understanding of biology, archaeology and geology. But exploring these blue hole environments brings danger as well as discovery. Scientists are interested in these caves because oxygen-free conditions there are similar to those on Earth long ago, before oxygen existed on our planet. But there are many difficulties involved in diving into blue holes.

5.___________

One reason blue holes have not been fully explored is that they can be extremely dangerous. There are many safety rules that divers must follow to help ensure their survival. First, divers must have training and experience to swim in these caves. Divers who explore a cave for the first time must establish a thin rope called a guideline. This line helps them to safely enter and exit the cave without getting lost.

 

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科目：高中英語(yǔ) 來(lái)源： 題型：單選題

Water________ oxygen and hydrogen.


  1. A.
    make up of
  2. B.
    is made of
  3. C.
    is made from
  4. D.
    is made up of

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科目：高中英語(yǔ) 來(lái)源： 題型：單選題

Water ____________ oxygen and hydrogen..


  1. A.
    contains
  2. B.
    is contained
  3. C.
    includes
  4. D.
    included

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科目：高中英語(yǔ) 來(lái)源： 題型：

Water ____________ oxygen and hydrogen..

A. contains           B. is contained            C. includes    D. included

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科目：高中英語(yǔ) 來(lái)源：廣東實(shí)驗(yàn)中學(xué)2009-2010學(xué)年度高一下學(xué)期期中段考模塊三考試英語(yǔ)試題 題型：單選題


Water ____________ oxygen and hydrogen..

A．containsB．is containedC．includesD．included

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