1. The SARS virus spreads through ___ by sneezing or coughing.
(A) blood
(B) droplets
(C) dropouts
(D) drug
答案:登入後查看
統計: A(25), B(98), C(80), D(17), E(0) #2158976
統計: A(25), B(98), C(80), D(17), E(0) #2158976