为了解课程改革实验区七年级学生对数学新教材的评价，应采用（ ）的方法来收集有关数据。
问卷调查
They have arrived at lunchtime but their flight was delayed.
A．will
B．can
C．must
D．should
牙龈瘤有
A．巨细胞B．R-S细胞C．泡沫细胞D．釉质E．黏液细胞
