[单项选择]

Text 1
On 5th December, 1945, five bombers from a United States Naval Air Station left Fort Lauderdale, Florida, on a routine training flight over the Atlantic Ocean, east of Florida. A short time later the base received radio messages from the bombers (Flight 19) saying that they were lost. Then radio contact was broken. The flight didn’t return, and the planes that were sent to look for the bombers also fail to return. A massive search operation was mounted, but no trace of the missing planes or their pilots was found. They had simply and inexplicably disappeared.
This event was sufficient to confirm in many people’s minds that the so-called "Devil’s Triangle", or "Bermuda Triangle"-- a section of the North Atlantic bounded roughly by Bermuda, Florida and Puerto Rico--really was haunted, and in some mysterious way was responsible for the loss of ships and planes. In all, in this area (3,900,000 square kilometres) of o
A. some unknown magnetic forces
B. underwater volcanic action
C. Sensational Journalism
D. something not yet known

Text 1
On 5th December, 1945, five bombers from a United States Naval Air Station left Fort Lauderdale, Florida, on a routine training flight over the Atlantic Ocean, east of Florida. A short time later the base received radio messages from the bombers (Flight 19) saying that they were lost. Then radio contact was broken. The flight didn’t return, and the planes that were sent to look for the bombers also fail to return. A massive search operation was mounted, but no trace of the missing planes or their pilots was found. They had simply and inexplicably disappeared.
This event was sufficient to confirm in many people’s minds that the so-called "Devil’s Triangle", or "Bermuda Triangle"-- a section of the North Atlantic bounded roughly by Bermuda, Florida and Puerto Rico--really was haunted, and in some mysterious way was responsible for the loss of ships and planes. In all, in this area (3,900,000 square kilometres) of o
A. some unknown magnetic forces
B. underwater volcanic action
C. Sensational Journalism
D. something not yet known

Passage Five
From the beginning rivers have played an important part in the life of man. Man of the earliest times used the rivers as a means of travel. Today rivers still serve as a great waterway for the transport and people.
In ancient times, man settled near rivers or on fiver banks and built up large empires.
Water is Nature’s most precious gift to man. Man needs water to irrigate his crops, to cook and to wash. In nations all over the world rivers mean life and wealth. They feed and clothe the nations around them.
Water is also a source of energy and power. Man constructs huge dams across the river to control the water for irrigation and get the energy needed to drive generators. The electrical power is then directed to homes, cities, factories and television stations.
Man uses water each day. His main source of water comes from reservoirs, which in turn get their water from the rivers.
Rivers also bring down soil
A. since the last century
B. for a very long time
C. since a few hundred years ago
D. since a few years ago