44. Following a telephone call to the police from an anonymous caller, hundreds of shoppers were shepherded out of the store while roads in the area were sealed off.

点睛　

follow此处意为“在……之后”，其现在分词形式引导句子的状语。anonymous意为“匿名的”。be shepherded out of意为“从……中被引导出来”，shepherd此处为动词，本身含有“带领，引导；护送”之意。如：
The super star came in, shepherded by her guards. 这位超级巨星在保镖的护送下进来了。
seal off意为“封锁，封闭”。

考点归纳　

与seal有关的常见短语搭配还有：
seal up意为“（为防止空气、水等渗入或渗出）封闭”。如：
Those doors have been sealed up for years. 那些门已经封闭多年了。
seal sb.'s fate意为“决定某人的命运（尤指厄运）”。如：
The words would seal his fate for ever. 那些话将决定他今后的命运。
seal in意为“密藏，封住”。如：
Fry the fish quickly to seal in the flavor. 把鱼快速煎好以保持原味。