单项选择题
A．overtaken B．overseen C．overlooked D．overwhelmed
A．Smokers are usually considered to be at high risk for it. B．It is the leading cause of cancer deaths around the world. C．159,000 new cases of it are diagnosed in the US each year. D．It often goes unnoticed until it has spread.
A．The Iceman was killed while working. B．The Iceman could have died from the wound in the head. C．The Iceman lived a poor life. D．The Iceman was struck dead from behind.