听力原文:W: With the convenience of bankcards, more and more people prefer bankcards to personal checks. M: I agree. People like bankcards because they offer greater safety and convenience than personal checks. Q: What can be inferred from the conversation? (20)
A.
A merchant doesn't know the balance before completing a sale.
B.
No security system has yet been devised for personal checks.
C.
A personal check is secure at the check stand.
D.
The clerk can examine all the bankcards.