单臀先露指的是

The University of Illinois experiment was different from previous studies in that______.A．its researchers categorized the children only by fitness levelsB．it highlighted the importance of students' running on a treadmillC．it showed how being fit affects children's performance on the testsD．it asked the subjects to complete tests that were beyond their levels 点击查看答案

担当社会管理创新历史重任的责任重大，主要体现在（）。

A.经济发展责任大
B.财税增加责任大
C.改善民生责任大
D.维护稳定的责任大

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