The strict teacher often makes _______ very tired. [ ]
A. we
B. our
C. us
D. ours
答案:C
石灰岩经过变质作用形成的变质岩是()
A.大理岩
B.石英岩
C.板岩
D.片麻岩
过敏性结肠炎的X线表现为()
A.乙状结肠不规则狭窄
B.局部结肠不规则挛缩及多发性小龛影
C.肠袋加深,排钡后见线样征
D.乙状结肠黏膜皱襞破坏
E.乙状结肠内不规则充盈缺损