胸腔积液叩诊音为（）
A.清音
B.鼓音
C.过清音
D.浊音
E.实音
参考答案：E
What class are you in? I think you are in _______. [ ]
A. Class Two, Grade One
B. Grade One, Class Two
C. class two, Grade One
D. grade one, class two
简述我国幼儿园的性质和任务。
