— I don't know the meaning of the word.
—You can just ______ in the dictionary.
A:look up it
B:look it up
C:look them up
D:look up them
It is .
如图所示,水平放置的平行金属板a、b分别与电源的两极相连,带电液滴P在金属板a、b间保持静止,现设法使P固定,再使两金属板a、b分别绕中心点O、O/垂直于纸面的轴顺时针转相同的小角度α,然后释放P,则P在电场内将做( )
家鸽受精卵的发育开始于( )
——Let's go to the movies on Saturday night.
——_________.