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问题 单项选择题

男，60岁，右侧颜面肿胀，右眼球渐突出5个月。CT显示右上颌窦腔增大，窦壁变薄伴局部骨质消失，窦腔内见软组织密度，含气消失。最可能的诊断是（）

A.鼻息肉

B.上颌骨骨髓炎

C.黏液囊肿

D.上颌窦癌

E.纤维血管瘤

答案

参考答案：D

单项选择题

The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus; the antibodies will increase in number for the next year or so. There is now a test that reliably indicates how many antibodies are present in a person’s body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.
Which one of the following conclusions is best supported by the statements above

A．Antibodies increase in number only until they have defeated the virus.

B．Without the test for antibodies, there is no way of establishing whether a person has virus X.

C．Antibodies are produced only for viral infections that cannot be fought by any other body defenses.

D．If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person’s body.

E．(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.
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单项选择题

诺贝尔经济学奖获得者，美国著名管理学家西蒙说：“管理就是决策。”“一个企业内，如果投资占1分，科技占3分，管理则占6分。”采用科学管理能够提高企业经济效益，这说明（）

①自在事物的联系落后于人为事物的联系

②人为事物的联系独立于自在事物的联系

③统筹全局能实现整体利益的最大化

④系统具有内部结构的优化趋向特征

A.①②

B.②③

C.①④

D.③④
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