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【单选题】

For years, doctors advised their patients that the only thing taking multivitamins does is give them expensive urine (尿). After all, true vitamin deficiencies are practically unheard of in industrialized countries. Now it seems those doctors may have been wrong. The results of a growing number of studies suggest that even a modest vitamin shortfall can be harmful to your health. Although proof of the benefits of multivitamins is still far from certain, the few dollars you spend on them is probably a good investment. Or at least that’’s the argument put forward in the New England Journal of Medicine. Ideally, say Dr. Walter Willett and Dr. Meir Stampfer of Harvard, all vitamin supplements would be evaluated in scientifically rigorous clinical trials. But those studies can take a long time and often raise more questions than they answer. At some point, while researchers work on figuring out where the truth lies, it just makes sense to say the potential benefit outweighs the cost. The best evidence to date concerns folate, one of the B vitamins. It’’s been proved to limit the number of defects in embryos (胚胎) , and a recent trial found that folate in combination with vitamin B 12 and a form of B6 also decreases the re-blockage of arteries after surgical repair. The news on vitamin E has been more mixed. Healthy folks who take 400 international units daily for at least two years appear somewhat less likely to develop heart disease. But when doctors give vitamin E to patients who already have heart disease, the vitamin doesn’’t seem to help. It may turn out that vitamin E plays a role in prion but cannot undo serious damage. Despite vitamin C’’s great popularity, consuming large amounts of it still has not been positively linked to any great benefit. The body quickly becomes saturated with C and simply excretes (排泄) any excess. The multivitamins question boils down to this: Do you need to wait until all the evidence is in before you take them, or are you willing to accept that there’’s enough evidence that they don’’t hurt and could help. If the latter, there’’s no need to go to extremes and buy the biggest horse pills or the most expensive bottles. Large doses can cause trouble, including excessive bleeding and nervous system problems. Multivitamins are no substitute for exercise and a balanced diet, of course. As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense. It has been found that vitamin E ________.

A.
should be taken by patients regularly and persistently
B.
can effectively reduce the recurrence of heart disease
C.
has a prive but not curative effect on heart disease
D.
should be given to patients with heart disease as early as possible
题目标签:胚胎排泄
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参考答案:
举一反三

【单选题】胚胎工程技术在生产中的应用不包括[ ]

A.
移植胚胎干细胞使退化的组织修复并恢复正常功能
B.
进行胚胎移植充分发挥雌性优良个体的繁殖潜能
C.
采用机械方法将早期胚胎分割产生同卵双胎
D.
在小鼠腹腔中培育杂交瘤细胞生产单克隆抗体

【单选题】睾丸下降开始于胚胎第( )

A.
5个月
B.
6个月
C.
7个月
D.
8个月
E.
9个月

【单选题】甲状腺形成的时间是胚胎

A.
第四周
B.
第五周
C.
第六周
D.
第七周
E.
第八周

【单选题】Section BDirections: There are 2 passages in this section.Each passage is followed by some questions or unfinished statements.For each of them there are four choices marked A, B, C and D.You should de...

A.
could not easily be absorbed by the human body
B.
were potentially harmful to people's health
C.
were too expensive for daily consumption
D.
could not provide any cure for vitamin deficiencies

【单选题】药物排泄的主要器官

A.
肝脏
B.
肾脏
C.
皮肤
D.
E.
心脏

【单选题】下列有关排泄的说法正确的是

A.
肾脏疾病会使肾小球滤过率明显下降,对肾小管主动分泌和重吸收功能影响不大
B.
若肾清除率小于肾小球滤过率,说明可能有肾小管分泌
C.
改变尿液的pH,主要会使肾重吸收发生变化
D.
肾小管重吸收只有被动扩散过程
E.
汗腺排泄和肾排泄是药物最主要的两条排泄途径
相关题目:
【单选题】胚胎工程技术在生产中的应用不包括[ ]
A.
移植胚胎干细胞使退化的组织修复并恢复正常功能
B.
进行胚胎移植充分发挥雌性优良个体的繁殖潜能
C.
采用机械方法将早期胚胎分割产生同卵双胎
D.
在小鼠腹腔中培育杂交瘤细胞生产单克隆抗体
【单选题】睾丸下降开始于胚胎第( )
A.
5个月
B.
6个月
C.
7个月
D.
8个月
E.
9个月
【单选题】甲状腺形成的时间是胚胎
A.
第四周
B.
第五周
C.
第六周
D.
第七周
E.
第八周
【单选题】Section BDirections: There are 2 passages in this section.Each passage is followed by some questions or unfinished statements.For each of them there are four choices marked A, B, C and D.You should de...
A.
could not easily be absorbed by the human body
B.
were potentially harmful to people's health
C.
were too expensive for daily consumption
D.
could not provide any cure for vitamin deficiencies
【单选题】药物排泄的主要器官
A.
肝脏
B.
肾脏
C.
皮肤
D.
E.
心脏
【单选题】毒物排泄最主要的途径是
A.
粪便
B.
唾液
C.
汗液
D.
母乳
E.
尿液
【单选题】下列有关排泄的说法正确的是
A.
肾脏疾病会使肾小球滤过率明显下降,对肾小管主动分泌和重吸收功能影响不大
B.
若肾清除率小于肾小球滤过率,说明可能有肾小管分泌
C.
改变尿液的pH,主要会使肾重吸收发生变化
D.
肾小管重吸收只有被动扩散过程
E.
汗腺排泄和肾排泄是药物最主要的两条排泄途径
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