评价学生学业成绩的方法很多，其中学生学业成绩评价的基本方法是（）
参考答案：测验法
He was really disappointed to find that he had failed to make himself ______, although he tried his best to describe vividly.
A．pay attention
B．paying attention to
C．paid attention
D．paid attention to
位于后纵隔脊柱旁肋脊区内最常见的纵隔肿瘤是（）。
A.胸腺瘤
B.心包囊肿
C.畸胎瘤
D.神经源性肿瘤
E.淋巴瘤
