关于非阵发性房室交界区性心动过速错误的是（） A.最常见的原因是洋地黄中毒 B.发作

患者女性，30岁，月经失调8年，结婚6年，原发不孕， * * 持续出血1月余，量时多时少。查体：身高160cm，体重70kg，体毛较重，心肺检查阴性，腹软，无压痛，未触及肿物。妇科检查：已婚外阴，阴毛较重， * * 通畅，内有少量血来自子宫，宫颈光滑，子宫后位，正常大小，双附件区未触及异常。B型超声检查：子宫正常大小，内膜厚10mm，双卵巢呈多囊性改变。

子宫内膜不典型增生的原因包括（）

A.长期不排卵

B.子宫内膜炎

C.多次流产

D.多囊卵巢综合征

E.卵巢分泌雌激素肿瘤

F.肥胖

G.长期口服避孕药

H.服用三苯氧胺

Celebrate. Celebrate. Physicians are delighted with a Food and Drug Administration (FDA) advisory panel’s recommendation earlier this year that Vioxx and its cousins Bextra and Celebrex (all medicines known as Cox-2 inhibitors) should remain on the market, despite evidence they increase heart disease risk in some people. The panelists reached their decision after weighing all the data and concluding the benefits of these pain-relieving drugs outweighed the risks.
Specifically, these scientists acknowledged that, for some patients, these prescription drugs were uniquely effective in reducing pain from arthritis and other causes. For others—concerned about ulcers associated with aspirin and other OTC analgesics—the Cox-2 inhibitors offered the advantage of minimizing potentially serious effects of stomach irritation.
Now is an appropriate time for everyone to take a fresh look at the benefit-risk equation for Vioxx and the other Cox-2 inhibitors.
The risks-increased risk of heart disease in some who use the drugs—have been well publicized. Much less publicity has been given to a spectrum of real and potential benefits that go way beyond reduced risk of stomach irritation. These little-discussed benefits would have been lost, perhaps permanently-had Vioxx, Bextra and Celebrex been driven from shelves in pursuit of perfect safety, an unattainable goal.
For example, there is substantial evidence Cox-2 inhibitors can reduce development of colon polyps, which may become colon canceL Indeed. Celebrex is FDA-approved for those genetically prone to colon cancer. Ironically, the 2004 study that revealed the elevated heart attack risk of Vioxx was primarily designed to further establish the drug’s effectiveness in protecting against colon cancer. And while the results of that interrupted trial have not yet been published, there is good reason to believe they will confirm the protective effects against colon cancer established in research over the last 10 years.
At the time of its withdrawal from the market last fall, studies of Vioxx as well as the other Cox-2 drugs suggest that they had other anti-cancer properties as well, possibly reducing the risk of malignancies of a number of sites, including the lung and esophagus.
Had these drugs been dismissed, their untapped promise for prevention would have evaporated well before it was evaluated and applied to save lives. Fortunately, cooler and wiser heads prevailed.

The possible benefits of Cox-2 inhibitors ______.

A．could hardly outweigh their risks

B．should be thoroughly studied

C．will show in curing stomachaches

D．may well be found in a much wider area

下列各项中，与血液运行关系最密切的脏是（）

A.心、肝、脾、肾

B.心、肝、脾、肺

C.心、肝、肺、肾

D.肺、脾、肝、肾

E.心、脾、肺、肾

钨钻类硬质合金按钴的含量不同进行分类，其中（）用于半精加工。

A.YG3

B.YG5

C.YG6

D.YG8

心动周期的叙述，正确的是（）

A.通常心动周期是指心房的活动周期

B.通常心动周期是指心室的活动周期

C.一般讲，周期中的收缩期长于舒张期

D.心房和心室没有共同舒张时期

E.心动周期持续的时间与心率无关