—Will students go to school to have lessons?
—________.
A：Yes, they won't
B：No, they won't
C：Yes, they are
D：No, they aren't
某溶液中存在大量的Na+、OH﹣、SO42﹣，该溶液中还可能大量存在的离子是（ ）
用动物细胞工程技术获取单克隆抗体，下列步骤中错误的是（ ）
