母亲怀孕早期哪些因素与先天性非遗传性聋有关()
A．外伤
B．患风疹
C．营养不良
D．患流感
E．大量应用耳毒性药物
参考答案：B, D, E
________ he _______ go to the doctor now? [ ]
A. Does, has to
B. Does, have to
C. Do, have to
D. Do, has to
临时设置地锚，采用角铁桩或钢管桩时，一组桩的主桩上应控制（）拉绳。
A.四根
B.三根
C.两根
D.一根
