Having been attacked by terrorists, _____. [ ]

A. doctors came to their rescue

B. the tall building collapsed

C. an emergency measure was taken

D. warnings were given to tourists

可摘局部义齿优于同定义齿之处是

A．磨牙少，易于保持口腔卫生

B．舒适美观

C．强度好

D．咀嚼效率高

E．以上都对