（辨认主题句）Read the following paragraph and write the topic sentence on the Answer Sheet.

We are on our way to becoming a cashless, checkless society, a trend that began with the credit card. Now some banks are offering “debit cards” instead of credit cards. The costs of purchases made with these cards are deducted from the holder’s bank account instead of being added to a monthly bill. And checking accounts, which are mainly used for paying bills, are going electronic. Now some people can make computer transactions over their pushbutton phones to pay bills by transferring money from their account to the account of whomever they owe. Soon we may be able to conduct most of our business without signing a check or actually seeing the money we earn and spend.