—We must thank you for taking the trouble to cook us a meal.

—________.

A．With pleasure

B．It doesn't matter

C．It was no trouble at all

D．By all means

骨软骨瘤的临床表现有（）。

A.肿瘤生长迅速

B.局部红肿、疼痛

C.多数无症状，无意中发现骨性肿块

D.X线片显示骨破坏，膨胀改变

E.常见部位是手或足的管状骨