299.Have all the important letters been delivered at the first time?
I'm sorry._______ only 40% of them.
A．It is
B．They are
C．There are
D．It has been
300._______ of the land in that district _______ covered with trees and grass.
A.Two fifth;is
B.Two fifth;are
C.Two fifths;is
D.Two fifths;are
299.答案是A；此处实际上考查的是强调句，强调的是数词。
300.答案是C；表示几分之几时，分子超过一，作分母的序数词要加s,此处五分之二代表的是不可数名词Land,此处的分数是单数。
