When a spacecraft travels, one of the major problems is reentry into the Earth ’s _______.
A、surfaceB
暂无解析
Pinetreesareusuallybelievedto_______coldweather.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Asateacher,youshouldnot_______thestudentsfromaskingquestionsinclass.
Inordertoincreaseouroutput,weneedtoimportmoreproduction_______.
Afterworkingfortwentyhourswithoutanyrest,thedoctorswere_______.
