观察病人面色时应首先注意区分（）
A.主色与客色
B.客色与病色
C.常色与病色
D.善色与恶色
E.主色与病色
参考答案：D
It has been announced by our provincial government that another two medical teams will be sent to _______ the injured people in the severe earthquake.
A．join to
B．join in
C．take part in
D．attend
长庚是中国古代对哪一颗行星的称呼？（）
A.水星
B.金星
C.火星
D.木星
