試卷:無年度 - 2005年5月托福閱讀#20892
| 科目:TOEFL(Test of English as a Foreign Language)托福
試卷資訊
試卷名稱:無年度 - 2005年5月托福閱讀#20892
科目:TOEFL(Test of English as a Foreign Language)托福
16. The phrase "This concern" in line 23 refers to the
(A) loss of vitamins in plants
(B) production of hardier species
(C) use of chemical fertilizers
(D) distribution of agricultural products