程度较重的耳聋发生在哪一年龄段最易造成因聋致哑的后果（）
A.3岁前后
B.4岁前后
C.5岁前后
D.6岁前后
E.7岁前后
参考答案：A
They want to know ____ do to help the suffering people in the earth-stricken area. [ ]
A. what can they
B. what they can
C. how they can
D. how can they
流行性乙型脑炎在冬春季流行。
