The underlined expression “figure out” in Paragraph 3 probably means _______.
A:look after
B:solve the problem of
C:draw a picture of
D:play a joke on
下列关于两栖动物的描述正确的是( )
鸦片战争成为中国近代史的开端,主要是因为( )
若向量BA→=(2,3),CA→=(4,7),则BC→=( )