1. [单选题]一艘轮船在海上遭遇风暴沉没，它从开始下沉到完全没入水中前，所受到的浮力变化情况是
A. 增大
B. 不变
C. 减小
D. 无法判断
2. [单选题]14．
A. up
B. down
C. on
D. off
3. [单选题]28． Mr Snow asked the Browns some questions to _________．
A. see if they had moved to a new house
B. find out how rich the Browns were
C. know where they'd keep their new pet
D. make sure they'd take good care of pets
