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.乙肠结肠黏膜皱襞破坏E.乙状结肠内不规则充盈缺损
参考答案:C
As he was too fat, he tried several shirts _______ but ____ fitted him.
A.on; none
B.in; some
C.on; some
D.in; none
“()”是指学习者与他能够做出反应的环境中的外部条件之间的相互作用。