Question

Rising evidence suggests that the use of the vaccines(疫苗)will be effective to       the spread of common cold

1. A.
   interrupt
2. B.
   threaten
3. C.
   contribute
4. D.
   abandon

Answer 1

A
动词辨析。A中断;遮断;阻碍；B威胁；C导致，投稿；D抛弃，放弃；根据句意使用疫苗可以有效的阻碍感冒的传播。