第18题: [单项选择]结肠炎的X线表现是() A. 结肠充盈良好,管壁光滑,结肠袋规则整齐 B. 结肠内充盈缺损,与肠壁不固定,随肠内容物活动 C. 结肠局限性不规则充盈缺损,结肠袋消失,管腔变窄,与正常肠壁分界清楚 D. 结肠有痉挛,可见向心性狭窄,肠袋变浅,肠壁见小毛刺状突出龛影 E. 结肠黏膜呈蚯蚓状或串珠状 参考答案:D
第21题: [单项选择]How much has the use of precision-guided weapons increased in the past few years
a. Less than 6%.
b. More than 6%.
c. More than 3%.
d. Less than 3%. 参考答案:C 答案解析:[分析] 数字信息的找寻和判断。
根据题干对数字信息的要求找到原文有关部分“...the proportion of such bombs used rose from no more tha