泄泻发病的主要关键是 ()
A.感受外邪
B.饮食所伤
C.情志失调
D.脏腑虚弱
E.脾胃功能障碍
参考答案:E
With the development of ________, various ________ come into being. [ ]
A. advertising; advertising
B. advertisement; advertisements
C. advertisements; advertising
D. advertising; advertisements
一般来说,人口的出生率和死亡率同社会经济发展水平呈( )
A.正相关 B.负相关C.不相关 D.周期波动