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问题 选择题

制作口腔上皮细胞临时装片时，在载玻片中央滴一滴生理盐水，其作用是（　　）

A．保持细胞的形态

B．避免细胞皱缩

C．避免细胞涨破

D．离散口腔上皮细胞

答案

答案：A

题目分析：生理盐水与口腔上皮细胞生活的液体环境浓度相同，盐水浓度过高，细胞会失水皱缩，浓度过低，细胞会吸水涨破，故生理盐水可以保持细胞正常的形态，A正确。

单项选择题

初生犊牛应尽早补喂初乳，一般不应晚于其出生后的（）小时。

A.24

B.48

C.72

D.96
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填空题

Bush’s MBA


Twenty-six of 42 presidents, including Bill Clinton, were lawyers. Seven were generals. George W. Bush becomes the first with an MBA.
Those who have had Bush for a boss since the mid-1980s—in the (1) of oil, baseball and Texas state government—describe his management (2) as straight from the pages of the organizational-behavior (3) he studied while getting his masters of business administration (4) at Harvard University in 1975.
He manages by what is known (5) "walking around," having learned that sitting behind a desk and passing out memos does (6) to energize anyone.
He has a reputation for fueling "creative tension" (7) his subordinates, encouraging them to take and defend opposing (8) . That sacrifices harmony, but puts ideas to the test and lets Bush (9) above the fray, where he can offer guidance instead of barking (10) . Imagine the creative tension that may erupt (11) the likes of Secretary of State-designate Colin Powell and Defense Secretary— (12) Donald Rumsfeld.
Above all, former employees say that he is a master at delegating (13) installing measures of accountability—ways of knowing (14) subordinates are getting the job done without looking (15) any shoulders. That frees Bush for strategic thinking—perhaps (16) two words hammered into MBA students most—which means thinking (17) to seize opportunities and to derail threats to the best of plans.
"George was my (18) ," says Tom Schieffer, who served as president of the Texas Rangers under Bush (19) 1991 and 1995. "But he never made me feel that way. He went out of his way to treat me as a (20) , not a subordinate."
That’s one trait that might be of concern, says Michael Useem, director of the Wharton Center for Leadership and Change at the University of Pennsylvania. It’s important for subordinates to feel part of the team, but not just because the boss craves popularity. Just as in the military, it must be understood who is in charge when the final order is given.
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