问题
选择题
The H1N1 flu spread very quickly at the beginning, __________, many people were ill.
A.therefore
B.instead
C.in advance
D.however
答案
答案:A
考查词义辨析。Therefore 因此,instead 代替,in advance 提前,however
然而,句意:H1N1病毒在开始传播的非常快,因此,许多人病了。所以选A。