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江西成考专升本英语阅读难点关键句六(6)

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江西成考网
发布日期
2017年04月19日

摘要：　　101. Thus in addition to the chances of going away from the right path outlined above，the scientific investigator shares with the ordinary citizen the possibilities of falling into errors of reasoning in the ways we have just indicated，and many othe

lowed these to take over in a steadily developing novel.

　　117. The best evidence for the layered mantle （地幔）thesis is the well-established fact that volcanic rocks found on oceanic islands，islands believed to result from mantle plumes （地柱）arising from the lower mantle，are composed of material fundamentally different from that of the midocean ridge system，whose source，most geologists contend， is the upper mantle.

　　118. In October 1838，I happened to read for amusement Malthus on Population，and being well prepared to appreciate the struggle for existence which everywhere goes on，from long continued observation of the habits of animals and plants，it at once struck me that，under these circumstances，favorable variations would tend to be preserved， and unfavourable ones to be destroyed.

　　119. But these beliefs about peptide hormones （肽激素）were questioned as laboratory after laboratory found that antiserums（抗血清）to peptide hormones，when injected into the brain，bind in places other than the hy