下列乳腺肿瘤，哪种屑原位癌范畴：
A．髓样癌B．单纯癌C．导管内癌D．硬癌E．黏液癌
参考答案：C
It's time ________ you ________ playing soccer. [ ]
A. of; to practice
B. for; to practice
C. for; practice
D.of; to practice
下列体现艰苦奋斗精神的是[ ]
①铁杵成针②精卫填海③延安大生产运动④天下兴亡，匹夫有责
A．①②③
B．②③④
C．①③④
D．①②④
