— How can I get along _____with others, Dad?— Try to smile to others, boy. That will make ________much easier.
A:good; them
B:good; it
C:well; them
D:well; it
如图,四边形ABCD是⊙O的内接四边形,⊙O的半径为2,∠B=135°,则 的长( )
某实验小组同学对双氧水制氧气的若干问题进行探究.
如图,小明将细绳的两端分别绕在两只手的食指上,再用食指堵住双耳.当小华用铅笔敲击衣架时,小明仍能听到敲击衣架的声音,这是因为( )