.. in diving suits, Captain Nemo walks around in this magic world.A．DressingB．Being dressedC．DressedD．To dress 题目和参考答案——青夏教育精英家教网—

??? 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.

根据短文内容，从下边的A—F选项中选出能概括每一段主题的最佳选项。选项中有一项为多余选项。

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.

School is over and it’s time for the family to get your children moving and have fun. Choose a suitable one from the following family activities.

Gymnastics

Gymnastics helps to improve flexibility, strength, and teaches self-discipline. Although Olympic-level gymnastics take years of practice to master, more simple moves are easy to learn in a day and can be practiced at home.

Suitable for: 4+

Cost: £6 an hour

Contact: British Gymnastics; 084 512 97129; www.british-gymnastics.org

Surfing

What is required to learn the art of surfing is to combine balance, coordination and patience, which means that it’s not easy to learning that, but the excitement of jumping to your feet on the board for the first time and riding a wave into the shore is an excellent experience.

Suitable for: 8+

Cost: £30 an hour

Contact: www.nationalsurfingcentre.com, 016 378 50737

Sailing

Sailing is beneficial for developing confidence and provides a pure mental and physical challenge from the beginning. It can be done alone, and picking up the basics is not difficult.

Suitable for: 8+

Cost: Free

Contact: Royal Yachting Association; 084 534 50400; www.rya.org.uk

Diving

This is a great way to make swimming even more fun. High board diving needs muscle control. Lessons begin at the poolside, where you will learn some basic skills before moving on to the boards, Try a saltwater pool, on warmer days, and enjoy the fresh air, high boards and water games.

Suitable for: 13+

Cost: The first lesson, which lasts one hour, is usually free if you decide to carry on. £10/£20 an hour.

Contact: Find your local swimming pool at www. britishswimming.org; 015 096 18700

1.If you have a child of seven, you would like to choose ______ for him/her.

A．Diving B．Sailing C．Surfing D．Gymnastics

2.Taking a 10-hour course in diving needs at least .

A．£200 B．£100 C．£90 D．£30

3.In order to build up your children’s confidence, you can call .

A．015 096 18700

B．084 534 50400

C．016 378 50737

D．084 512 97129

4.According to the passage, we know that .

A．it is very difficult to learn basic sailing skills.

B．it is impossible to practice gymnastics at home

C．self-discipline is needed to do high board diving

D．surfing needs qualities of patience and balance

The Florida Sea Base Programs

Diving Adventure

If you are a diver, this is your program. During the program you will be making as many as nine dives (weather permitting), including a night dive. We have open dates in June, July and August for the summer months and for fall we have opening in September, October, November and December. Check out the dates today. Click here!

Sea Exploring!

The name brings back the memory of pirates(海盗) sailing the high seas of the past. This adventure is for larger teams of 18 to 20 teammates. Sailing on a tall ship with your team, you will be making memories that you will share for the rest of your life with anyone who will listen. Be sure and check out the dates we have open. Click here! We can fit your timetable to meet your needs with these great dates.

Live Aboard Diving

The Florida Sea Base has the sailing and diving programs joined for one wonderful adventure! On this adventure, you will spend your days not only in diving, but also in sailing around the Florida Keys. There are openings this fall and winter. Check now for open dates to spend your winter holidays in the keys. Click here! Fall dates are open now. Check them out today!

Just around the corner: the Christmas season in the keys! We have an opening for the Live Aboard program on December 26. Book today---it won’t last long!

Diving Certification(证书)

The Diving Certification program is designed for teammates who want to get a certification--- all who complete the week successfully will be offered PADI certification! Come and learn how to dive in the beautiful waters of the Florida Keys.

We have the following dates open: August 5, August 12, August 19, August 22 and August 26. We also have programs we offer in the fall: September 30, October 7, October 14, October 21, and many more dates. Check out the rest of the dates. Click here!

55. The text is most probably found _________.

A. in a newspaper B. on the Internet

C. in a science magazine D. in a book about Florida Sea

56. Colin wants to join in the Diving Adventure. He is supposed to have ______.

A. 9 dives B. 10 dives

C. 19 dives D. as many dives as he likes

57. According to this text, Live-Aboard Diving is special in that ____.

A. diving goes on during the sailing

B. it is an adventure at sea

C. there are diving programs in it

D. it is held in the Christmas season

58. The purpose of the text is mainly to ________.

A. teach B. introduce C. report D. advertise

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