螺旋体感染应首选下列哪种药物:
A.红霉素B.四环素C.头孢哌酮D.青霉素E.庆大霉素
参考答案:D
In China, smokers have to face the reality that ______ people are dying of lung cancer.
A.a great number of
B.a great deal of
C.a good many of
D.the number of
网络课程是通过网络表现的某门学科的教学内容及实施的教学活动的总和。