肾盂肾炎和下尿路感染的主要区别在于（）
A.尿中有无血细胞
B.有无膀胱刺激征
C.有无全身症状和腰痛
D.有无高血压
E.以上都对
参考答案：C
基础写作。
现在有越来越多的中国人在学英语，包括儿童，青少年以及成年人。请根据实际情况和你了解的知识说说人们为什么要学英语。
提示： teenager（青少年） adult（成年人）
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The waterfall can be seen ____. Its sound may be heard ____ twomiles. It looks even more
beautiful ____, I think. [ ]
A. at a distance; in the distance of; from a distance
B. from a distance; in the distance of; at a distance
C. in the distance; from a distance; at a distance
D. in the distance; at a distance of; from a distance
