半深海是水深()米的大陆斜坡地带。
A.200~2000
B.300~30000
C.250~2500
参考答案:C
Car seatbelts save lives. Every driver should wear________to ensure their safety. [ ]
A. this
B. it
C. that
D. one
总结的种类按内容分包括()
A.工作总结
B.生产总结
C.学习总结
D.个人总结