The passage is mainly about（）

单项选择题According to the passage, we cannot work all the time without（）

A．taking part in sports activities
B．watching sporting events on television
C．listening to sporting events on the radio
D．recreation

单项选择题We learn from the first paragraph that（）

A．Jack is a dull boy because he works all day long
B．recreation is necessary for all of us
C．we should maintain good health and enjoy life
D．we should work more efficiently