What is the passage mainly about ？（）

单项选择题What did Columbus bring back on his second trip ？（）

A．Fried potatoes.
B．Tomato juice.
C．Sweet corn.
D．Chocolate beans.

单项选择题The reason why the toys most boys play with are different from those that girls play with is that （）.

A．their social roles are rigidly determined
B．most boys would like to follow their fathers’’ professions
C．boys like to play with their fathers while girls with their mothers
D．they like challenging activities