讨论下列各函数列{fn}在所定义的区间上： （a){fn}与{f'n}的一致收敛性； （b){fn}是否有定理13.9，定理13

这笔款项已过期两个多月仍未结清。（)

A.It has been due for more than two months.

B.It has been overdue for less than two months.

C.It has been overdue for more than two months.

D.It has been overdue for more than three months.

He has been fighting bravely against a ()(晚期的) cancer for more than two years.

A、terminal

B、pleasant

C、technical

D、plastic

A．A.about

B．B.around

C．C.over

D．D.nearly

How long has the St. Louis County Library been in its current location？

A．For three years．

B．For less than two months．

C．Not sur

E．

His parents are worried because they haven't heard of their son in more than two months.

A．worried

B．because

C．of

D．in

has been in the making of automobiles. Between the appearance of these two editions, a whole new science related to the making of dictionaries , the science of descriptive linguistics, has come into being.

A、About three months.

B、About six months.

C、About two years.

D、About three years.

More than one person here ____ with the disease.

A)has been infected

B)have been infected

C)has been infecting

D)have been infecting

Eve has been in the Far East for

A．the last two months.

B．the last two weeks.

C．the last three weeks.

How long has the man been learning English？

A．Half a year.

B．About two months.

C．Three years.