男性，18岁，左膝上方肿物伴疼痛3个月就诊，X线片示左胫骨上端出现浸润性破坏，边界不清，出现Codman三角表现，此病人最可能的诊断是（）。

A.骨软骨瘤

B.尤文肉瘤

C.骨肉瘤

D.骨结核

E.骨瘤

小题1:Excuse me, may I b________ your ruler? Mine is left at home.

小题2:It is very h________ today. How about going swimming this afternoon?

小题3:Don’t forget to bring everything with you. Let’s meet at the school g________ at 9:00 tomorrow.

小题4:You can trust him. He never tells a l________.

小题5:The bedroom is very dirty. You should c________ it at once.