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练习7-1：（1）西门子工业网络由哪些类型构成？（2）什么是PROFIBUS？（3）什么是PROFINET？（4）两者区别是什么，至少回答3点区别？
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In Leaves of Grass, _________ is all that concerned Whitman.
We can perhaps summarize that Walt Whitman's poems are characterized by all the following features EXCEPT they are ________.
Walt Whitman was a founding figure of American poetry. His innovation first of all lies in his use of __________.
The theme of _________ may be well stated as "It sings of nationalism and of the nature of the self in relation to the cosmos and the meaning and purpose of birth and death."
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