Natural sources include (but are not limited to): .
A、Windblown dust
B、Volcanic ash and gases
C、Smoke and fly ash from forest fires
D、Pollens and other aeroallergens
A、Windblown dust
B、Volcanic ash and gases
C、Smoke and fly ash from forest fires
D、Pollens and other aeroallergens
Many word processing programs include spell checker. It checks the spelling of every word in a(1)by looking up each word in its dictionary. If the word does not appear in the dictionary the user is(2)to a possible misspelling and possible corrections are often(3)Spell checker dies not recognize unusual people names or specialized terms, but it will often allow you to create your own personal dictionary of specialized words you often use. Spell checker is a valuable aid to proofreading, but it can not catch the(4)ofone correctly spelled word for another (such as form for from). Thus it does not(5)a document is free of spelling errors.
A、a. as a means of raising revenue for public purposes.
B、b. when policymakers believe that the market price of a good or service is unfair to buyers or sellers.
C、c. when policymakers detect inefficiencies in a market.
D、d. All of the above are correct.
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