—You seem to have lost your way.______

   —I’m looking for Buck’s Cottages.

A．Why so?

B．What are you looking for?

C．Need help?

D．Where are you from?

放射性核素骨显像通常能较X线检查提前多长时间发现骨转移性肿瘤（）。

A.3～6个月

B.1～2个月

C.7～9个月

D.6～12个月

E.1～2年