參考答案及解析：

　　1.The correct answer is E

　　Explanation

　　There is no error in this sentence. The plural present tense verb “indicate” agrees with the plural subject “the results.” The phrase “both safer and” appropriately introduces the compound subject complement “both safer and more effective.” And the verb phrase “was…assumed” appropriately indicates an action that occurred in the past: i.e. what scientists thought before the new studies.

　　2.The correct answer is C

　　Explanation

　　The error in this sentence occurs at (C), where there is improper modification. It does not make sense to say that “Finland’s borders” are “One of the northernmost countries of Europe.” The proper noun “Finland” should be used instead.

　　3.The correct answer is B

　　Explanation

　　The error in this sentence occurs at (B), where there is subject-verb disagreement. The singular verb “comes” should be changed to the plural “come” to agree with the plural subject “Audio recordings, and the equipment used to make and play them.”

　　4.The correct answer is B

　　Explanation

　　The error in this sentence occurs at (B), where there is awkward and unidiomatic phrasing. The awkward “that it has” should simply be “to have.”

　　5.The correct answer is C

　　Explanation

　　The error in this sentence occurs at (C), where there is a flaw in parallelism. The pronoun “they” should be removed so that the sentence contains three parallel verbs (“became,” “built,” and “developed”).

　　6.The correct answer is E.

　　Explanation

　　Choice (E) is correct. There is no error in the sentence.

　　The following sentence contains either a single error or no error at all. If the sentence contains an error, select the one underlined part that must be changed to make the sentence correct. If the sentence contains no error, select choice E.

　　7.The correct answer is D

　　Explanation

　　The personal pronoun “I” in the prepositional phrase “with your adviser or I” is an object of the preposition “with” and should be in the objective case. The corrected phrase should be: “with your adviser or me.”

　　8.The correct answer is A

　　Explanation

　　The error in this sentence occurs at (A), where there is subject-verb disagreement. To agree with the plural verb “lie,” the singular “origin” must be changed to the plural “origins.”

　　9.The correct answer is A

　　Explanation

　　The error in this sentence occurs at (A), where a comma splice is created. To fix the comma splice, “It weaves” should be changed to “Weaving.”

　　10.The correct answer is B

　　Explanation

The error in this sentence occurs at (B), where there is an improper idiom. The idiom is “ranges from x to y,” not “ranges from x and y.”