霍乱大流行的最主要传播途径是
A．食物传播B．水源传播C．直接接触D．苍蝇媒介E．空气传播
参考答案：B
选择填空。
You ______ your clothes now. [ ]
A. had better to wash
B. had better wash
C. had better washing
D. would better wash
若想通过以下输入语句使a=5.0，b=4，c=3，则输入数据的形式应该是______。 int b,c；float a； scanf("%f,%d,c=%d",&a,&b,&C)
