具有调节进入眼内光线作用的是()
A.巩膜
B.虹膜
C.脉络膜
D.角膜
E.视网膜
参考答案:B
Volunteers ______people ______the neighbourhood _____ different problems this weekend.
A.help; in; with
B.will help; in; with
C.are going to help; with; in
D.are helping; in; with
工业企业向金融、房地产行业扩展,属于()。
A.纵向多元化
B.横向多元化
C.相关多元化
D.无关多元化