What is the purpose of a library catalog?

a. to you navigate through the physical library building
b. to indicate whether the library owns a particular book
c. to list materials by the authors first names

The answer is indeed letter B. To indicate whether the library owns a particular book.

Explanation:

A catalog is a list of items ordered in a systematic manner (alphabetically, for example). A library catalog lists the bibliographical material that can be found in that library. That, of course, includes the books the library owns. It can, however, have other sorts of bibliographical items, such as maps, graphs, realia etc. Having that explanation in mind, the best option among the ones given in the question is letter B - the purpose of a library catalog is to indicate whether the library owns a particular book.

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.

well,

i dont learn that but this link might you out !

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hope this : )