高一英语unit one-unit two,单项选择,要解析
17.As a result of destroying the forests,a large( )of desert ( )covered the land.
A.number,has B.quantity,has Cnumber,have Dquantity,have
18.They had a pleasant chat ( )a cup of coffee
A.for B.with C.during D.over
19.Some students often listen to music ( )classes to refresh themsleves
A.between B.among C.over D.during
20.—What are you mailing,Ryan?—A textbook（ ）a new method of teaching physics.I want my friends to take a lood at it .
A.is based on B.based on C.basing Dwhich based upon
21.China is ___ the weat of Japan but it is lies ___the east of Aisa
A.in,to B.to,from C.in,on D.to,in