根据外汇管理法律制度的有关规定，债务人逾期未履行偿债义务超过5年，确实不能收回的外汇资金，可以作为外汇呆账。 ( )

Cigarettes and alcohol do such ________ great harm to health that they can easily cause ________ weakening of our bodies.

A．a; /

B．/; the

C．a; the

D．/; /