Explanation

　　1.The correct answer is E

　　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

　　The error in this sentence is (C): the verb "were" (which is plural) does not agree in number with the noun "quality" (which is singular). The correct sentence reads: The board reviewing the courses offered by the college found that the quality of academic programs was generally good but somewhat uneven.

　　3.The correct answer is C

　　The error in this sentence occurs at (C), where there is an improper idiom. In order to appropriately complete the correlative construction, the word “also” must be inserted after the conjunction “but.” This results in the correlative construction “not only…but also.” In addition, what follows “not only” must be grammatically parallel to what follows “but also,” so the word “but” should be changed to “but also because.”

　　4.The correct answer is E

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

　　5.The correct answer is E

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

　　6.The correct answer is C

　　The error in this sentence is (C): the word "heavy" in the phrase "heavy veiled" should not be in the form of an adjective but in the adverbial form since it is used to modify the participle "veiled." The correct sentence reads: Maude Adams, after her spectacular triumph as the original Peter Pan, went about heavily veiled and was accessible to only a handful of intimate friends.

　　以上就是这6例SAT改错题练习题的全部内容，小编提醒考生在解答这些SAT改错题的时候，不要害怕选择No Error选项，如果相信自己是正确的，确实没有发现错误，当然就要选择No Error。