B.they had little or no sense of environmental protection
C.they were not aware of the importance of nature study
D.they had no idea of how to make good use of raw materials
1.To avoid repeating the mistakes of our forefathers, the author suggests that _____ A.we plant more trees
B.natural sciences be taught to everybody
C.environmental education be directed toward everyone
D.we return to nature2.How can you understand the underlined sentence in the last paragraph?
A.Our living space earth is getting smaller and smaller.
B.Our living space should be measured in cubic volume.
C.We need to take some measures to protect space.
D.We must preserve good living conditions for both birds and animals.During the years after the terrorist attack on the World Trade Center, structural engineers have been trying hard to solve a question that would otherwise have been completely unthinkable: Can building be designed to stand catastrophic blasts () by terrorists?
Soon after the terrorist attacks on e twin towers, structural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering Research (MCEER) traveled to ground zero as part of a project funded by the National Science Foundation.They spent two days beginning the task of formulating() ideas about how to design such structures and to search for clues on how to do so in buildings that were damaged, but still are standing.
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