不同地貌、地物的外部特征，对防护目标还有不同的伪装作用。
参考答案：对
I prefer skiing to climbing because I think climbing is ______ skiing. [ ]
A. not as exciting as
B. not more exciting as
C. not most exciting as
D. more exciting than
治疗肺炎链球菌性肺炎应首选( )。
A．红霉素B．庆大霉素C．四环素D．青霉素E．氯霉素
