单项选择题
A.promote B.improve C.guarantee D.both A and B
The first communication satellite was used for the purp...
单项选择题The first communication satellite was used for the purpose of（）.
A.taking the place of the radio system B.introducing a new life-saving system C.saving the vessels in distress D.improving the communication on land
A sailor on board（）from appendicitis and required opera...
单项选择题A sailor on board（）from appendicitis and required operation immediately.
A.was suffering B.is suffering C.has suffered D.has been suffering
The foreign seafarers said goodbye to us and looked for...
单项选择题The foreign seafarers said goodbye to us and looked forward to（）each other soon.
A.see B.seeing C.be seen D.being seen
