1.no one
1)不與of連用；2)謂語動詞用單數(shù)；3)只能指人,但不具體指什么人；4)一般用來回答who,及含
　　　anyone,anybody引起的疑問句.如：
1)No one like a person with bad manners.
2)——Who is in the room?
——No one.
3)——Is there anyone in the room?
——No one.
2.none
　　1)可與of連用；2)謂語動詞用單或復數(shù)；3)具體指什么人或物；4)一般用來回答how many +n,how
　　　much +n及含any+n引起的疑問句.請看：
　　1)None of us have/has seen him.
　　2)——How many students are there in the room?——None.
　　3)——Is there any water in the thermos?——None.
　　4)——How much money do you have on you?——None.
How do you find your new classmates,有how故選a