— Driving on icy roads is very dangerous! The more ice there is, the _______ down the road you have to look.You should be more careful.
— OK, I will.
A:more far
B:farer
C:farther
D:farthest
在光滑的水平面上有一个小球a以初速度v0向右运动,以此同时,在它的正上方有一个小球b也以v0的初速度水平向右抛出(如图),并落于水平面的c点,则 ( )
判断镁条在空气中燃烧是化学变化的依据是( )
既是2和5的倍数,又是3的倍数的数是( )