Fifty years ago, nature study was not part of school work: scientific forestry was a new idea; wood was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climate cycles in relation to proper land use; even the word “conservation” had nothing of the meaning that it has for us today.

　　For the sake of ourselves and those who will come after us, we must now set about correcting the mistakes of our forefathers .Conservation should be made part of everybody’s daily life. To know about the water table in ground is jus as important to us as knowledge of the basic math formulas. We need to know why all watersheds need the protection of planet life and why the running, current of streams and rivers must the duly of planting trees as well as of cutting them. We need to know the importance of big, grown trees, because living space for most man’s fellow creatures on this planet is figured not only in square measures of surface but also in cubic volume above the earth. In a word, it should be our goal to restore as much as the original beautify of nature as we can.

　　68. The author’s attitude towards the use of natural resources is ____

　　A. Positive

　　B. uninterested

　　C. optimistic

　　D. critical

　　69. According to the author, the greatest mistake of our forefathers was that ______

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