该年级学生的患龋率为（）。

A．victims may sign a document to get new identification
B．identification will not be required for financial assistance
C．800 families will be allowed to get the money first
D．identity may be accepted without an official paper

A．The points earned for buying goods can sometimes be used as money.
B．Loyalty cards enable the retailer to know customers’ shopping habits.
C．Loyalty cards attract customers back to the same retailer.
D．With no discount, loyalty cards can still make more sales.

A．were in a hurry to collect wallets and purses
B．were in too great a panic to think what to take
C．couldn’t find wet towels to avoid choking
D．didn’t take anything but wallets and purses