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  3. General acceptance of 3-D films may prove hard to come by, as the experience of three decades ago indicated.

General acceptance of 3-D films may prove hard to come by, as the experience of three decades ago indicated.

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问题 General acceptance of 3-D films may prove hard to come by, as the experience of three decades ago indicated.
选项 A、obtain
B、explain
C、understand
D、discern
答案A
解析 本题中，come by意为“得到，获得”。四个选项中，obtain意为“达到，得到”，如：He obtained a knowledge of Latin．(他学会了拉丁文。)explain意为“解释，说明”；understand意为“懂，了解”；discern意为“识别，认出”。只有A项符合题意。
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