From the text we can see that the writer t

参考答案:

D

态度题。根据题干关键词定位到文章最后一段。此题考查作者对新型房间钥匙未来前景的看法．根据最后一段第一句Yet it is still not clear that virtual keys will dobetter than previous attempts to circumvent traditional check—ins．(但虚拟钥匙的效果会不会比前一些试图改变传统入住手续的尝试更好还不清楚。)可知，作者对新型房间钥匙的未来不够确定。故D项“不确定的”符合题意，为正确答案。A项“乐观的”；B