问题 单项选择题

自身免疫性溶血性贫血患者,长期以来反复发生溶血,近1周上呼吸道感染,其后贫血日渐加速,血红蛋白50g/L,网织红细胞o.001,白细胞28×109/L,分类:中性粒细胞0.52、淋巴细胞0.48,骨髓三系细胞增生减低,网状细胞、浆细胞多见,最可能是()

A.脾功能亢进

B.急性溶血状态

C.再障危象

D.骨髓纤维化

E.以上均不是

答案

参考答案:C

单项选择题

A


"In only six clays I lost seven pounds of weight. "
"Two full inches in the first three days!"
These are the kinds of statements used in magazine, newspaper, radio and television ads. , promising new shapes and new looks to those who buy the medicine or the device. The promoters of products say they can shape the legs, slim the face, smooth wrinkles, or in some other ways to add to beauty or desirability.
Often such products are nothing more than money-making things for their promoters. The results they produce are questionable, and some are dangerous to health.
To understand how these products can be legally promoted to the public, it is necessary to understand something of the laws covering their regulation. If the product is a drug, FDA (Food and Drug Administration)can require proof (证明) under the Food, Drug, and Cosmetic Act that is safe and effective before it is put on the market. But if the product is a device, FDA has no authority to require pre-marketing proof of safety or effectiveness. If a product already on the marker is a danger to health, FDA can request the producer or distributor to remove it from the market voluntarily, or it can take legal action, including seizure (查封) of the product.
One notable case a few years ago involved an electrical device called the Relaxacisor, which had been sold for reducing the waistline. The Relaxacisor produced electrical shocks to the body through contact pads. FDA took legal action against the distributor to stop the sale of the device on the grounds that it was dangerous to health and life.
Obviously, most of the devices on the market have never been the subject of court proceedings (法律诉讼), and new devices appear continually. Before buying, it is up to the consumer to judge the safety or effectiveness of such items.

FDA can ask for the proof of safety and effectiveness of a product ______.

A.if it is a drug

B.if it is a device

C.if its consumers make complaints

D.if its distributors challenge FDA’s authority

单项选择题