单项选择题
A．To teach at a university. B．To patent his inventions. C．To spend his remaining years. D．To have a three-week holiday.
A．It is elaborately decorated. B．It has survived some 2,000 years. C．It is very big, with only six slim legs. D．It is shaped like an ancient Spanish boat.
A．In case some problem should occur. B．Something unexpected has happened. C．To avoid more work later on. D．To make better preparations.