—Could you tell me ______ way to Taylor Clinic?  

—Sorry, but I’m afraid there is not ______ Taylor Clinic nearby. [ ]

A. a; a    

B. a; the       

C. the; the        

D. the; a

父亲和儿子的年龄和为50岁，三年前父亲的年龄是儿子的三倍，多少年后儿子年满18岁( )

A．2

B．4

C．6

D．8