心动超声评价心室舒张期正常时（）.
A.E／A不应小于2.0
B.E／A不应小于3.0
C.E峰=A峰
D.A峰
E.A峰>E峰
参考答案：D
Mr Smith _______ in America this time last year. [ ]
A. travelled
B. would travel
C. has travelled
D. was travelling
中亚热带常绿阔叶林下发育的地带性土壤是黄壤或黄棕壤。
