冷冻干燥技术是把含有水分的物料预先进行降温、冻结成____以下的固体，在真空条件下使水直接____以除水分的一种干燥技术。

A. rotten
B. isolated
C. outdated
D. broken

A. adventures
B. appliances
C. attempts
D. applications

A. found
B. injured
C. stolen
D. robbed

A. though
B. if
C. since
D. until