(Line 4, Para. 3, Passage 1)
We need to know why all watersheds (水滨) need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea.

A．Her husband had never been home so late.
B．Her husband looked so sick.
C．Her husband seldom came back on weekdays.
D．Her husband loved his work more than his family.

A．Graduate studies at the state university.
B．Effect of education on one’s success.
C．Education in high school.
D．The importance of family education.