:笔试部分(100分)
五、单项选择。(每小题1分，共计15分)
( )21.—Is this ________ useful book about health?
—Yes，many famous doctors in it encourage us to take ________ active part in sports.
A．a；/ B．an；/ C．an；an D．a；an
( )22.—What are they used ________？
—Cutting things，and they are made ________ metal.
A．to；of B．for；by C．for；of D．to；by
( )23.The concert must be wonderful.The tickets were ________ in an hour.
A．looked for B．sold out
C．thrown away D．brought back
( )24.—What about playing basketball this afternoon together，Sam?
—I would rather ________ at home than ________basketball.Its too hot outside.
A．stay；playing B．staying；play
C．stay；play D．staying；playing
( )25.—Is the tall man William in the library?
—No.It ________ be William.He has gone to Shanghai.
A．mustnt B．cant
C．neednt D．couldn
