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Compared to common electrical conductors, superconductors

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根据下列文章,请回答 31～35 题。
第 31 题 What does the writer suggest in the first paragraph about our attitudes to mobile phones？

Mary just told us a very fascinating story.

It can be seen from the passage that the each’S supply of natural medicines

A. may never be exhausted．
B. may be dropping rapidly．
C. is surprisingly big．
D. is as rich as ever．

The trains on the DLR are controlled by