鉴别尿崩症为肾性或中枢性，以下哪项为首选
A．垂体后叶素试验B．禁水试验C．尿和血浆渗透压D．头部MRIE．以上都是
参考答案：A
—_____ you _____ a brother?
—Yes, I have. I've got a younger brother. [ ]
A. Do; have
B. Have; got
C. Do; got
D. Are; have
简述商业银行信用风险的主要形式。
