问题 单项选择题 A1型题

铜绿假单胞菌导致角膜迅速溶解坏死的主要原因是()

A.铜绿假单胞菌生长速度快

B.角膜的微环境适合铜绿假单胞菌的生长

C.铜绿假单胞菌分泌的胶原酶降解角膜胶原纤维

D.引起了机体的抗原抗体反应

E.以上都不正确

答案

参考答案:C

解析:革兰阴性细菌角膜感染,多表现为快速发展的角膜液化性坏死。其中铜绿假单胞菌引起的感染具有特征性,该型溃疡多发于角膜异物剔除术后或戴接触镜引起的感染。也见于使用了被铜绿假单胞菌污染的荧光素钠溶液或其他滴眼液。起病迅速、发展迅猛,患者眼痛明显,严重的睫状充血或混合性充血,甚至球结膜水肿。主要原因在于铜绿假单胞菌产生蛋白分解酶,使角膜呈现迅速扩展的浸润及黏液性坏死,因此导致角膜快速溶解的原因选择C。

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President Bush arrived in Washington and forged ahead with an ambitious agenda- (1) tax cuts, vast changes in federal social programs, expansions of executive power and (2) broad remaking of energy and education policies.
Claiming a mandate by simply declaring (3) existence, his early successes dazzled his critics. With guru Karl Rove directing the (4) , Bush won a stunning series of political victories.
He muscled his agenda through (5) friendly Congress, and gained seats for his party in the 2002 midterm elections. (6) biggest triumph came in 2004, when he won a second term despite a (7) unpopular war.
The "permanent" Republican majority he and Rove envisioned even seemed attainable (8) Bush plunged himself into his most ambitious legislative effort yet: a partial privatization (9) Social Security.
But the president who boasted about "political capital" in the heady (10) after his re-election now faces the worst of political fates as he enters (11) final year in office: borderline irrelevance.
The president’s second term has (12) defined by legislative paralysis, marked by record-low approval ratings, presidential candidates who are (13) from his shadow, and a lingering war that’s sapping his remaining reservoirs of (14) .
As he enters his final year in office with the war continuing, Republican (15) for president bolting from his shadow, and his party back in the minority (16) Congress, he is politically weakened, an early entry into lame-duck status.
And the (17) Washington atmosphere he hoped to cure is just as nasty as it was (18) he came to office seven years ago.
"lie’s left our political institutions much (19) troubled than they were before," said Thomas E. Mann, a senior fellow at (20) Brookings Institution, a Washington-based think tank. "He didn’t create the ideological polarization, but he magnified it. \