A:content
B:substance
C:material
D:mixture
—Do you have any problems if you ______ five minutes to read?—Well, I'm thinking about the new words. There are too many.
已知a,b,c三个数在数轴上对应的点如图所示,则下列式子中正确的是 ( )
观察下图,意大利航海家哥伦布的航海路线是( )