下列哪些疾病属常染色体隐性遗传()
A．肝豆状核变性
B．糖原累积病
C．苯丙酮尿症
D．粘多糖病
E．21-三体综合征
参考答案：A, B, C, D
Much to her delight, three _________ neighbors showed up and several of them even brought with them some candies and cookies.
A．dozens
B．dozen
C．dozen of
D．dozens of
油气井井口距学校、医院、油库、河流、水库、人口密集及高危场所等不小于（）。
A、200m
B、500m
C、1000m
