Questions 28-30 Choose the appropriate letters A-D and write them in boxes 28-30 on your answer sheet. *

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问题 Questions 28-30
Choose the appropriate letters A-D and write them in boxes 28-30 on your answer sheet.

*

选项 A、YES
B、NO
C、NOT GIVEN

答案C

解析 The passage states that the book contained copied formulas but there is no information regarding their sources.
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