先天性肌性斜颈的病因学说有（）.
A.遗传学说
B.宫内学说
C.血运障碍学说
D.产伤学说
E.综合学说
参考答案：A, B, C, D, E
(2013·莱州一中期末检测)He didn't expect that his parents could manage to know ________ is going on in his college life on the Internet.
A．how
B．which
C．what
D．that
航班号第一位数字为（）的是中国航空集团公司的航班号。
A.“1”
B.“2”
C.“0”
D.“3”
