I have _________to English Weekly for five years.   [ ]

A. subscribed                    

B. ordered    

C. placed an order              

D. bought

制冷装置供液电磁阀应装在紧靠（）的管路上。

A.膨胀阀前

B.膨胀阀后

C.背压阀前

D.背压阀后