单选题What’s the probable relationship between the man and the woman? A Colleagues.B Classmates.C Husband and wife.

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What’s the difference between casual listening and focused listening?
If we listen with no particular purpose in mind, and often without much concentration, the kind of listening is called casual listening. Usually we do not listen very closely, unless we hear something that particularly interests us, and afterwards we may not remember much of what we heard. However if we listen for a particular purpose, to find information we need to know, the kind of listening is called focused listening. In these situations we listen much more closely; but we do not listen to everything we hear with equal concentration—we listen for the most important points or for particular information. Usually we know beforehand what we are listening for.
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In the book"Nature",Emerson stated that（）

Aman.s relationship with nature transcends the idea of usefulness

Bnature is useful to man

Cnature is independent of man and has nothing to do with man

Dnature can only be used by man

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What is the relationship between the grammatical forms of a language and their communicative functions?
While one form can be used to perform a number of functions, one function can be realized by using a number of different forms.
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