B Some people enjoy deep-sea diving as a sport. But for most divers it is a way of reaching jobs th——青夏教育精英家教网—

摘要：B Some people enjoy deep-sea diving as a sport. But for most divers it is a way of reaching jobs that must be done under water. For example, deep-sea divers raise sunken ships. They help build underwater foundations for bridge and piers. Sometimes, divers recover great treasures of gold and silver and other valuable cargoes from the holds of sunken ships. A diver faces danger each time he goes under water. His life depends on a steady supply of air pumped to him through a hose from the surface . He usually wears a bulky waterproof suit and a metal helmet that make it difficult to move about. Often a diver must grope his way through icy water filled with mud and silt that make it hard to see. Swift currents may hurl him against an obstacle and tangle his air hose. If a diver rises to the surface too rapidly, he may suffer a sickness called the bends. There are four main kinds of deep-sea divers. Commercial divers salvage sunken ships, cargoes, and aircraft, and help build or repair docks , breakwaters, piers, bridges and pipelines. Open-sea divers harvest sponges, pearl oysters, seaweed,and other products of the sea. Reseach divers search the bottoms of oceans for oil and conduct scientific investigations of sea life, geology, and oceanography. Military divers blow up harbour defenses, clear mines from harbours, scout shore lines, and also salvage sunken ships and aircraft. 86. When petroleum becomes exhausted, what kind of diver will be busier? A. Open sea B. Research C. Military D. Commerce 87. A culture-pearl raiser could be a(n) . A. research diver B. open-sea diver C. commercial diver D. military diver 88. Which of the following equipment a diver never takes? A. rifle B air pump C. waterproof suit D. air hose 89. Breakwater means most nearly . A. shelter of a harhour B. dam C. explosion under water D. pier 90. Which of the following suggested titles gives the best description of the passage? A. The Modern Knight in Armor B. Diving for Sunken Ships C. Diving for Fun D. Deep-sea Diving

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Nowadays some people enjoy deep-sea diving as a sport．But for most divers it is a kind of job that must be done under water．For example, one of the jobs that deep-sea divers do is to raise the ships lying on the bottom of the sea.

A diver faces danger each time he goes under water．His life depends on a supply of air sent to him through a pipe from the surface．He usually wears a big waterproof suit and metal helmet (头盔，钢盔) that make it difficult to move about.

Often a diver must use his hand to find his way to see．Fast moving sea water may push him against something hard and makes the air pipe out of order．If a diver rises to the surface too rapidly, he may suffer a sickness called the bends．Divers can be mainly divided into several groups．Commercial divers raise the ships, goods and airplanes on the bottom of the sea and help build or repair port bridges and pipelines．Open-sea divers pick up seaweed and other products of the sea．Research divers search the bottom of oceans for oil and make a scientific study of sea life and oceanography．Military (军事) divers blow up harbor works, clear mines from ports, and also raise ships and airplanes under the sea.

1．The air a deep-sea diver breathes is supplied by ________.

A．men on a shore or in a boat above

B．a box in his hand

C．a box on his back

D．a helmet

2．A diver may face many dangers because of ________.

A．the darkness under the sea

B．fast moving sea water

C．rising to the surface of the sea too quickly

D．all of above

3．When a diver is deep in the sea he can’t rise to the surface of the sea rapidly because ________.

A．he may get any illness

B．his waterproof suit is too heavy

C．the air pipe connected to his metal helmet is too long

D．it is too dark in the sea for him to find the way to the surface of the sea

4．________ will be sent to study the life of seaweed.

A．Commercial divers

B．Military divers

C．Open-sea divers

D．Research divers

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