A. They dad no idea about scientific forestry

　　B. They dad littler or no sense of environment protection

　　C. They were not awore of the importance of nature study

　　D. They dad no idea of how to make good of raw materials

　　70. To avoid repeating, the mistakes of our forefathers, the author suggests that _____

　　A. We plant more trees

　　B. Natural sciences he taught to everybody

　　C. Environmental education be given to everybody

　　D. We return to nature

　　71. How can you understand the underlined sentence in the lat paragraph?

　　A. Our living space on the hearth 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 condition for both birds and animals.

　　E

　　People always think about “the problem of youth”. If there is one –which I take leave to doubt- it is older people who create it, not young themselves. Let us get down to fundamental s and then the young are after all human beings –people just like their elders. There is only one difference between and old man and young one: the young man has a beautiful future before him while the old man a splendid future behind him and maybe that id where the rub is.

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