The following sentences contain errors in their use of dashes, parentheses, semicolons, or colons. Identify the answer choice that corrects the errors, according to the instructions in parentheses.
For help with this exercise, see section 28g of Focus on Reading and Writing.
Scientists from the Search for Extraterrestrial Intelligence or SETI for short are getting help from ordinary personal-computer users. (De-emphasize “or SETI for short.”)
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The agency has one purpose to locate intelligent life in the universe. (Place a colon.)
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The SETI scientists use a formula they collect radio signals from space, filter the information through computers, and examine it for sound patterns. (Place a colon.)
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SETI receives more information from space which is very noisy than its own computers can analyze. (Emphasize “which is very noisy.”)
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Scientists came up with a solution they asked ordinary computer users to share their computers with SETI. (Place a semicolon.)
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