染色体畸变属于
A．生物性致病因素B．理化性致病因素C．先天性致病因素D．遗传性致病因素E．免疫性致病因素 9．病原微生物属于
参考答案：D
—Are there any tickets left?
—Sorry. There are ________, if ________.
A．few; any
B．a few; some
C．some; few
D．a little; some
“精明之府”指
A．头
B．脑
C．脉
D．胆
E．髓
