根据投资者适当性制度规定,自然人投资者申请开立股指期货交易编码时,保证金账户资金余额不低于人民币()万元。
A.10
B.20
C.50
D.100
参考答案:C
During the summer vacation, several provinces have ________distance learning to help their teachers to
improve their teaching skills and update their professional knowledge.[ ]
A. attended
B. adopted
C. adapted
D. admitted