单项选择题
A．how to hunt whales for their oil and meat B．the hard and dangerous lives that whalers had to live C．the duties of each man on a whaling ship D．a man who was swallowed by a whale and lived
A．The teachers did lots of writing on the board. B．The teachers were invited to attend several lectures. C．The students were professors from a university. D．The students were studying science and humanities.