轻度烧伤如以Ⅱ度烧伤面积计算，下列正确的是
A．9%以下
B．10%～19%
C．20%以上
D．30%～49%
E．50%以上
参考答案：A
When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping.
A．that
B．where
C．which
D．when
中年的年龄界定为（）岁。
A.7～12岁
B.12～24岁
C.35～59岁
D.60岁以上
