In the foreign exchange market, which is made up of banks'traders and brokers, prices（61)

In the foreign exchange market, which is made up of banks' traders and brokers, prices (61) every minute (62) to supply and demand. For safety's sake, a branch will get a rate from their traders for a big transaction. Therefore the traders give their branches lists of exchange rates (63) they may buy and sell notes and payments in the main currencies.

Whenever a bank in Britain makes a payment in foreign currency, or makes a payment in sterling to a non-resident, the payment has first to (64) under British exchange control regulations. The bank itself can usually authorize the payment after seeing a document such as an invoice to show that the payment is due; but cases (65) borrowing and lending have to be referred to the Bank of England.

(46)

A．alter

B．vary

C．turn

D．convert