—What is your plan for the holiday?

—I’d like _______the days with my family ________climbing.

A．to spend; going

B．to spend; to go

C．spending; going

D．spending; to go

植物组织培养属于（）范畴。

A.蛋白质工程

B.基因工程

C.微生物工程

D.细胞工程