Questions 16-20 are based on the following passage:
Firefighters are often asked to speak to school and community groups about the imprtance of fire safety.particularly fire prevention and detection.Because smoke detectiors reduce the risk of dying in a fire by half,firefighters often provide audience with information on how to install these protective devtces in their homes.
Specifically,they tell them these things.A smoke detector should be placed on each floor of a home While sleeping,people are in particular danger of an emergent fire,and there must be a dectector outside each sleeping area.A good site for a detector would be a hallway that runs between living spaces and bedrooms.
Because of the dead-air space that might be missed by not air bouncing around above a fire,smoke detectors should be installed either on the ceiling at least four inches from the nearnest wall,or high on a wall at least four,but no further than twelve,inc
A. preventing a fire
B. surviving a fire
C. detecting a hidden fire
D. not getting injured in a fire
Watercolor is the oldest painting
medium known. It dates back to the early cave dwellers who discovered they could
add lifelike qualities to drawings of animals and other figures on the walls of
caves by mixing the natural colors found in the earth with water. Fresco, one of the greatest of all art forms, is done with watercolor. It is created by mixing pigments and water and applying these to wet plaster. Of the thousands of people who stand under Michlangelo’s heroic ceiling in the Sistine Chapel, very few are aware that they are looking at perhaps the greatest watercolor painting in the world. The invention of oil painting by the Flemish masters in the fifteenth century led to a decline in fresco painting, and for the next several centuries watercolor was used mainly as a medium A. Early cave dwellers. B. Italian fresco artists. C. Flemish masters. D. Eighteenth-century English artists. [单项选择]Questions 16-20 are based on the following passage:
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