The streets of the Dual Springs neighborhood, a migrant-worker hub in northern Beijing, are ______ . That’s no surprise; more than 13,000 people have been quarantined in China’s capital to halt the insidious spread of severe acute respiratory syndrome (SARS).

A．deserted

B．vacated

C．unlived in

D．removed

图层面板上每个图层的左侧均有一个眼睛图标，请问眼睛图标的作用是什么（）。

A.控制图层是否被锁定

B.控制图层的显示与隐藏

C.控制图层是否链接

D.表示图层的类型