When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
A、surfaceB
暂无解析
Wedonothavea_______schoolinourinstitute.ThehighestdegreeweprovideforthestudentsisaB.A.andaB.S..
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
The_______workcontinuedformorethanaweekbuttherewasstillnosignofthemissingboy.
Wecannottrusthimanymorebecauseheoften________hisduty.
Muchofthenewsprovidedbythisnewspaperis_______,notforeign.
