小儿室间隔缺损在几岁以后一般不会自然闭合()
A.1岁
B.2岁
C.3岁
D.4岁
E.5岁
参考答案:E
一般情况下,当期权为()时,期权的时间价值为最大。
A.极度实值
B.极度虚值
C.平值
D.实值
He no longer lives on campus, for he _____ an apartment within the walking distance to the school.
A.will rent
B.rented
C.has rented
D.had rented