会阴下降综合征一般不主张手术治疗。

骨样骨瘤的病变特点应除外（）

A.好发于下肢骨、脊椎骨

B.患骨疼痛明显

C.肿瘤多位于骨皮质，直径常>2cm

D.X线检查可见放射状透光性瘤巢

E.瘤巢由纤细的致密骨样组织小梁构成

—There _________a big earthquake in Japan this March.

—Yeah. Many Chinese volunteers went there to help the people in trouble.

A. was          B. is           C. were

楼房火灾要分层截击，下层火灾，上层设防。

An analyst does research about various companies and stocks. A company has experienced stable earnings over the previous years and the company has a high beta. These factors best describe a:

A. cyclical company and a defensive stock.
B. defensive company and a cyclical stock.
C. defensive company and a defensive stock.