You can use a large plastic bottle, ______ cut off, as a pot to grow flowers in.

A．the top is

B．the top of which

C．whose top

D．with its top

如果央行向乙银行贷款100万元，该行将之用于购买央行100万元债券，则乙银行的准备金发生什么变化？用央行和乙银行的T型账户来解释。