公共娱乐场所应当依法办理消防设计审核、竣工验收和消防安全检查，其消防安全由（）负责。
A.生产者
B.消费者
C.公安机关
D.经营者
参考答案：D
John: _________
Jack: In two weeks.
John: Are you going to Japan?
Jack: No. I'm going to Australia. I went to Japan two years ago.
A．How long have you been here?
B．When is your holiday?
C．When are you leaving for Australia?
D．How long do you plan to stay here?
该M型图提示（）
A.风湿性心脏病二尖瓣狭窄
B.高血压心脏病
C.左房黏液瘤
D.扩张型心脏病
E.肥厚性心肌病
