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题目材料：
Most shells of most species of snails coil the same direction, conventionally called right-handed. Shells with left-handed coiling are exceedingly rare. Yet engravings of snails in books for naturalists from the seventeenth century always show the shells coiling left. The engraving process produces a mirror image of what is drawn on the engraving plate. Nevertheless, the reversal of the shell images was clearly a convention rather than an artifact of the process, since ________.
Which of the following most logically completes the argument?
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A.the text that appears in seventeenth-century engravings of snail shells reads in the usual way from left to right
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B.the fact that not all snail shells coil in the same direction was not generally known to naturalists of the seventeenth century
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C.present-day books for naturalists sometimes contain snail photographs that are reversed because a photographic negative has been turned around by mistake
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D.the primary interest of naturalists of the seventeenth century was in the correct description and classification of structures
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E.most of the engravings illustrating seventeenth-century books for naturalists were drawn from observation of actual living specimens and not copied from other drawings
A显示答案
