試卷：無年度 - 2003年8月托福閱讀#20899
| 科目：TOEFL(Test of English as a Foreign Language)托福
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試卷名稱：無年度 - 2003年8月托福閱讀#20899
科目：TOEFL(Test of English as a Foreign Language)托福
5,The purpose of the “guncotton” mentioned in paragraph 2 was to
(A)trap particles for analysis
(B)slow the process of putrefaction
(C)increase the airflow to the microscopic slide
(D)aid the mixing of alcohol and ether
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