Studies show that the younger a child starts to smoke the greater are his （）of dying early.

单项选择题Today there is widespread agreement among researchers that （）of fathers from households causes serious problems for children.

A．absence
B．departure
C．failure
D．decline

单项选择题The students have been advised to （）a healthy lifestyle---a balanced diet, plenty of sleep and a positive mental attitude.

A．live
B．adopt
C．form
D．establish