下列各项中属于社会问题的是()。
There are some police cars in front. What do you suppose _____?
2014年7月在非洲大路上爆发了一场严重的病毒感染事件,该疫情是由_______病毒引起,临床表现为高热、头痛、肌痛、恶心、结膜充血相对x脉,病后四五天患者可出现_____________的命运。
During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.
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