— Only________ people can afford to travel around the world.
—Not exactly. I heard that a poor student travelled around the world with little money.
A:rich
B:poor
C:strong
公有制为主体,多种所有制共同发展是我国现阶段的 ( )
4+7=____
a→,b→为平面向量,已知a→=4,3,2a→+b→=3,18,则a→,b→夹角的余弦值等于( ).