The old man has ______ beard.[ ]
A. a
B. an
C. the
D. /
答案：A
Granny seems ill. Are you sure it's ______? [ ]
A. nothing serious
B. anything serious
C. serious nothing
D. serious anything
下列哪项应激源对人体健康危害最大
A．应激性生活事件B．环境应激源C．日常生活的困扰D．与工作有关的应激源E．以上都不是
