(单选题)

What is the author’s attitude towards the development of the paper-based batteries?

A.Defensive.

B.Optimistic.

C.Doubtful.

D.Ambiguous.

参考答案：B

参考解析：

推理判断题。根据最后一段倒数第二句“The beauty of the paper devices is that you can simply fold them to connect them. And they surely will be a trend in the near future.”可知，纸质设备的美妙之处在于，你可以简单地将它们折叠起来连接起来。而且在不久的将来，它们肯定会成为一种趋势。故选B。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语