Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need. F=A+E

81. _______________

Airplanes are used to carry passengers, cargo and mail. Air transport companies operate scheduled airlines and non-scheduled services over local, regional, national, and international routes. The aircraft operated by these companies range from small single-engine planes to large multiengine jet transports.

82._____________                      

The first air passenger services began in 1910, when dirigibles began operation between            several German cities. The first scheduled airplane service to carry passengers began in the U.S in 1914. Several experimental airmail flights took place in India, Europe, and the United States before World War I, but air transport service did not become a true business until after the war.

83. _____________

During World War Two, intercontinental air transport became firmly established. After the war the new long-distance transports with advanced facilities were increasingly able to avoid storms and strong wind and make flights more economical and consistent. A new generation of "jumbo-jet" transports began operations in 1970, and the supersonic transport entered passenger service in 1976.

84. _________

     During the 1970s the number of domestic passengers on U.S airlines increased about 78%, and during the 1980s the figure was up about 58%. In 1990 there were 41.8 million international passengers, the figure was a 75% increase over 1980. The total cargo flown by U.S airlines almost doubled during the 1980s, from 5.7 billion to 10.6 billion ton-miles in 1990.

85. ________________

Major airports provide a wide range of facilities for the convenience of millions of travelers. These range from such basic services as ticket-sales counters and resultants to luxury hotels, shopping centers and play areas for children. International airports must also have customs areas and currency-exchange

counters and so on.

Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need. F=A+E

81. _______________

Airplanes are used to carry passengers, cargo and mail. Air transport companies operate scheduled airlines and non-scheduled services over local, regional, national, and international routes. The aircraft operated by these companies range from small single-engine planes to large multiengine jet transports.

82._____________                      

The first air passenger services began in 1910, when dirigibles began operation between            several German cities. The first scheduled airplane service to carry passengers began in the U.S in 1914. Several experimental airmail flights took place in India, Europe, and the United States before World War I, but air transport service did not become a true business until after the war.

83. _____________

During World War Two, intercontinental air transport became firmly established. After the war the new long-distance transports with advanced facilities were increasingly able to avoid storms and strong wind and make flights more economical and consistent. A new generation of "jumbo-jet" transports began operations in 1970, and the supersonic transport entered passenger service in 1976.

84. _________

     During the 1970s the number of domestic passengers on U.S airlines increased about 78%, and during the 1980s the figure was up about 58%. In 1990 there were 41.8 million international passengers, the figure was a 75% increase over 1980. The total cargo flown by U.S airlines almost doubled during the 1980s, from 5.7 billion to 10.6 billion ton-miles in 1990.

85. ________________

Major airports provide a wide range of facilities for the convenience of millions of travelers. These range from such basic services as ticket-sales counters and resultants to luxury hotels, shopping centers and play areas for children. International airports must also have customs areas and currency-exchange

counters and so on.[???:]

It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans.
Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.
Earth scientists announced at a news conference recently that they had used the system for closely
monitoring a deep-sea volcanic eruption （爆发） for the first time and that they plan similar studies.
Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.
The speed of sound in water is roughly one mile a second—slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope （听诊器） does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
81. The passage is chiefly about ____ .
A. an effort to protect an endangered marine species
B. the civilian use of a military detection system
C. the exposure of a U.S. Navy top-secret weapon
D. a new way to look into the behavior of blue whales
82. The underwater listening system was originally designed ____ .
A. to trace and locate enemy vessels
B. to monitor deep-sea volcanic eruptions
C. to study the movement of ocean currents
D. to replace the global radio communications network
83. The deep-sea listening system makes use of ____ .
A. the sophisticated technology of focusing sounds under water
B. the capability of sound to travel at high speed
C. the unique property of layers of ocean water in transmitting sound
D. low-frequency sounds travelling across different layers of water____
84. It can be inferred from the passage that____.
A. new radio devices should be developed for tracking the endangered blue whales
B. blue whales are no longer endangered with the use of the new listening system
C. opinions differ as to whether civilian scientists should be allowed to use military technology
D. military technology has great potential in civilian use
85. Which of the following is true about the U.S. Navy underwater listening network?
A. It is now partly accessible to civilian scientists.
B. It has been replaced by a more advanced system.
C. It became useless to the military after the cold war.
D. It is indispensable in protecting endangered species.

It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.

So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans.

Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies.

Earth scientists announced at a news conference recently that they had used the system for closely

monitoring a deep-sea volcanic eruption （爆发） for the first time and that they plan similar studies.

Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures.

The speed of sound in water is roughly one mile a second—slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope （听诊器） does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.

81. The passage is chiefly about ____ .

A. an effort to protect an endangered marine species

B. the civilian use of a military detection system

C. the exposure of a U.S. Navy top-secret weapon

D. a new way to look into the behavior of blue whales

82. The underwater listening system was originally designed ____ .

A. to trace and locate enemy vessels

B. to monitor deep-sea volcanic eruptions

C. to study the movement of ocean currents

D. to replace the global radio communications network

83. The deep-sea listening system makes use of ____ .

A. the sophisticated technology of focusing sounds under water

B. the capability of sound to travel at high speed

C. the unique property of layers of ocean water in transmitting sound

D. low-frequency sounds travelling across different layers of water____

84. It can be inferred from the passage that____.

A. new radio devices should be developed for tracking the endangered blue whales

B. blue whales are no longer endangered with the use of the new listening system

C. opinions differ as to whether civilian scientists should be allowed to use military technology

D. military technology has great potential in civilian use

85. Which of the following is true about the U.S. Navy underwater listening network?

A. It is now partly accessible to civilian scientists.

B. It has been replaced by a more advanced system.

C. It became useless to the military after the cold war.

D. It is indispensable in protecting endangered species.