CT检查中不使用的对比剂是（）
A.非离子碘对比剂
B.离子碘对比剂
C.口服碘对比剂
D.硫酸钡制剂
E.1.2%碘水
参考答案：D
The teacher noticed him ________basketball on the school playground a moment ago.[ ]
A. played
B. to play
C. playing
D. was playing
冰川--冰川期（）
A.保险--保险金
B.断代--断代史
C.近日--近日点
D.年夜--年夜饭
