A：分子数
B：原子数
C：质子数
D：电子数
读课文 《拿来主义》，理解“几位‘大师’们捧着几张古画和新画”一句中的“捧”字，最正确的一项是（ ）
His family are worried about him because they haven't __________ letters from him for a long time.
