由于长期寒冷引起局部血管收缩、静脉淤血使末梢血液循环不好所致的疾病称（）。

A.冻疮

B.皮炎

C.湿疹

D.日光疹

E.糜烂

The number of people at present _____ sixty, but a number of people _____ coming here to get tickets for free. [ ]

A. is; is

B. is; are

C. are; are

D. are; is