根尖脓肿与骨膜下脓肿鉴别点是
A．疼痛程度不同
B．脓肿部位不同
C．牙髓有无活力
D．松动度的有无
E．扪诊有无波动感
参考答案：E
—What do you do at the weekend, Jim?
—I prefer ______ to ______. [ ]
A. playing computer games; going out
B. playing computer games; go out
C. to play computer games; going out
D. play computer games; go out
从历史角度看，21世纪的商界呈现出两个明显的趋势：（）和以杠杆收购为主要手段的全球兼并收购浪潮。
