A．Hear another report.
B．Discuss one of Emily Dickinson's poems.
C．Hear a lecture by the teacher.
D．Discuss poems they have written themselves.

A．help mariners.
B．improve ship design and sailing method.
C．study astronomy and mathematics.
D．improve his own skill as a sailor.

A．make longer deep-sea voyages.
B．travel faster than those in use at that time.
C．explore the coastline of Portugal.
D．carry larger crews and more cargo than existing ones.