Stimson线
参考答案：Stimson线：麻疹患者前驱期的特征性表现，对诊断具有重要意义。表现为在下眼睑边缘有一条明显充血横线。
John hadn’t been able to stop smoking suddenly;he had to control his smoking desire ________.
A．by and by
B．sooner or later
C．little by little
D．from time to time
封建社会新闻活动得到进一步发展的历史背景，它与原始社会新闻活动相比有哪些相同点和发展？
