5. The successful use of antitoxins and serums had virtually _____ the threat of malaria, yellow fever, and other diseases.
(A) denounced
(B) impelled
(C) eradicated
(D) propelled

The successful use of antitoxins and serums had virtually _____ the threat of malaria, yellow fever, and other diseases.

成功使用抗毒素和血清實際上_____瘧疾、黃熱病和其他疾病的威脅。

 antitoxin 抗毒素

serum 血清

 (A) denounced  v.（公開）譴責，痛斥

EX. The government's economic policy has been denounced on all sides.

政府的經濟政策受到了各方面的譴責。

(B) impelled   v.推動、推進或敦促某人做某事；

EX.  He felt impelled to resign. 他覺得必須提出辭職.

 (C) eradicated  v.剷除  adj.畫著根的；v.摧毀，完全根除

EX. The government claims to be doing all it can to eradicate corruption.

政府聲稱正盡其所能根治腐敗。

 (D) propelled  v.推進，推動

EX.  a rocket propelled through space 在推力作用下穿越外太空的火箭