1. Of the more than 1000 bicycling deaths each year, three-fourths are caused by head injuries. Half of those killed are school- age children. One study concluded that wearing a bike helmet can reduce the risk of head injury by 85 percent. In an accident, a bike helmet absorbs the shock and cushions the head. From "Bike Helmets: Unused life savers", consumer reports (May 1990): 348.
2. While the Sears Tower is arguably the greatest achievement in skyscraper engineering so far, it's unlikely that architects and engineer have abandoned the quest for the world's tallest building. The question is: just how high can a building go? Structural engineer William LeMessurier has designed a skyscraper nearly one-half mile high, twice as tall as the Sears Tower. And architect Robert Sobel claims that existing technology could produce a 500 story building. From Ron Bachman, "Reaching for the Sky." Dial (May 1990): 15.
Paraphrasing paragraphs
1. According to customer reports from "Bike Helmets: Unused life savers" (1990), each year, the head injury is the main cause of three- fourths of the one thousand bicycling deaths and students account for 50%. A study claims that thank to use bike helmet, the risk of head injury can be decreased by 85% because it can help bicylist to imbibe the shock and buffer the head when meeting with an accident.
2. In "Reaching for the Sky", Ron Bachman(1990) shows that the finding for the world's the tallest building have never given up by engineers and architects though the Sears Tower is probably being considered as the greatest success in skyscraper emgineering. So. What height can building be built to? In fact, William LeMessurier , a structural engineer, has designed a skyscraper approximately one-half mile high which is twice as tall as the Sears Tower. In this time, in accordance with an architect's assertion, Robert Sobel, a building of 500 storeys could be built by applying high technology.