THE CONCERT WAS _______ BECAUSE OF THE HEAVY RAIN.A. PUT OUT B. R...

55. The concert was _______ because of the heavy rain.

A. put out B. run out C. called off D. set off

VII. Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of

the questions.

Recent technological advances in manned and unmanned vehicles, along with breakthroughs in satellite technology

and computer equipment, have overcome some of the limitations of divers and diving equipment for scientists doing

research on the great oceans of the world. Without a vehicle, divers often became sluggish, and their mental

concentration was severely limited. Because undersea pressure affects their speech organs, communication among divers

has always been difficult or impossible. But today, most oceanographers avoid the use of vulnerable human divers,

preferring to reduce the risk to human life and make direct obervations by means of instruments that are lowered into

the ocean, from samples take from the water, or from photographs made by orbiting satellites. Direct observations of the

ocean floor can be made not only by divers but also by deep-diving submarines in the water and even by the technology

of sophisticated aerial photgraphy from vantage points above the surface of more than seven miles and cruise at depths

of fifteen thousand feet. In addition, radio-equipped buoys can be operated by remote control in order to transmit data

back to land-based laboratories via satellite. Particularly important for ocean study are data about water temperature,

currents, and weather. Satellite photographs can show the distribution of sea ice, oil slicks, and cloud formations over

the ocean. Maps created from satellite pictures can represent the temperature and the color of the ocean’s surface,

enabling researchers to study the ocean currents from laboratories on dry land. Furthermore, computers help

oceanographers to collect, organize, and analyze data from submarines and satellites. By creating a model of the ocean’s

movement and characteristics, scientists can predict the patterns and possible effects of the ocean on the enviroment.

Recently, many oceanographers have been relying more on satellites and computers than on research ships or even

submarine vehicles because they can supply a greater range of information more quickly and more effectively. Some of

humankind’s most serious problems, especially those concerning energy and food, may be solved with the help of observations

made possible by this new technology.