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【单选题】
某人投资了三种股票，这三种股票的方差一协方差矩如下表，矩阵（i，j）位置上的元素为股票I与j的协方差，已知此人投资这三种股票的比例分别为0.1，0.4，0.5，则该股票投资组合的风险是（）A.
9.2
B.
8.7
C.
12.3
D.
10.4
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【单选题】－_____? －He is friendly and polite. [ ]
A.
What does he look like
B.
What does he like
C.
What is he like
D.
What is he alike
【简答题】散剂的组成包括A.药物 B.适宜的辅料 C.适宜的溶剂 D.适宜的基质A. 1 B. 1 C. 1 D. 1
【单选题】—'What does your uncle like?' —'_______.' [ ]
A.
He is very tall
B.
He's like a doctor
C.
He likes football
D.
He isn't very old
【简答题】患者女，50岁，因“感冒1周，劳累后胸闷、呼吸困难，夜眠咳嗽3d”来诊。2个月以来工作紧张，近1周感冒，咳嗽、咳痰，经治疗感冒症状减轻，但劳累后常感胸闷、呼吸困难，夜间睡眠卧位时常有咳嗽，需要高枕。25年前患风湿热。查体：T36.4℃，P75次/min，R24次/min，BP105/60mmHg；面部双颊紫红，口唇轻度发绀；心尖部可触及舒张期震颤，闻及舒张期隆隆样杂音，第一心音亢进及左房室瓣开放拍...
【单选题】— ______? — He's friendly and helpful. [ ]
A.
What does he like?
B.
What is he like?
C.
What is he alike?
D.
What is he look like?
【单选题】—____________________? —He is tall.
A.
How is he
B.
What does he look like
C.
What does he like
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