在我党历史上，第一次比较系统地提出和论述社会主义初级阶段理论是在（）。
A. 党的"十三大"上
B. 党的"十二大"上
C. 党的十一届三中全会上
D. 党的"十五大"上
______
A. material
B. equipment
C. medium
D. Channel
Madonna and Michael Jackson axe not considered heroes because_______.
A. they are popular only among certain Stoups d people
B. their performances do not improve their fans morally
C. their primary concern is their pwn financial interests
D. they are not clear about the principles they should follow
______
A. optical
B. radio
C. electrical
D. Magnetic
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