I felt _____ my heart would burst with joy when I heard the news that Chang'e I was sent up successfully

to turn around the moon. [ ]

A. even if

B. if only

C. as if

D. only if

沉积物采样点位通常为水质采样垂线的（），沉积物采样点应避开（）、沉积物沉积不稳定及水草茂盛、（）之处。