问题 阅读理解

Vitamin E supplements(补充品),which millions take in the hope of longer, healthier lives, may do more harm than good, researchers reported on Wednesday.

In fact, people taking high doses(剂量)of vitamin E may in some cases be more likely to die earlier, although the reasons are not clear, said Dr. Edgar Miller of Johns Hopkins University in Baltimore, who led the study.“I think people take vitamin E because they think it is going to make you live longer, but this(study)doesn’t support that.”Miller told reporters.

Miller and colleagues reanalyzed 19 studies of vitamin E and health between 1993 and 2004. The tests involved more than 136,000 mostly elderly patients in North America, Europe and China. People who took 200 international units of vitamin E a day or more died at a higher rate during the study, which lasted three years, than people who did not take supplements, they told a meeting of the American Heart Association.“It’s about a 5 percent increased risk at 45 years in the tests combined together,”Miller said.“That doesn’t sound like a lot but if you apply it to 25 percent of the (U.S.)adult population taking vitamin E, that is significant.”

Miller, whose findings are also being published online by the Annals of Internal Medicine, said twothirds of people who take vitamin E supplements take 400 IU or more.“We don’t think that people need to take vitamin E supplements, which they can get enough from the diet,”he said. Nuts, oils, whole grains and green leafy vegetables are all rich in vitamin E.

小题1: People take vitamin E supplements, hoping that________.

A.they can lose weight easily

B.they may live a longer and healthier life

C.they can get more and more beautiful

D.they no longer need any medicine小题2: The following statements can give us information about Miller EXCEPT_________.

A.Miller and his team based their research on 19 cases of vitamin E and health between 1993 and 2004

B.Miller thinks it unnecessary for people to take vitamin E supplements

C.Miller supposes it impossible for people to get enough vitamin E from their diets

D.Miller played an important role in the tests conducted by the researchers小题3:  Which of the following contains rich vitamin E?

A.Nuts.

B.Whole grains.

C.Green leafy vegetables.

D.All of the above.小题4: What is this text mainly about?

A.It is reported in a study that vitamin E may do more harm than good to people to live longer and get healthier.

B.Dr.Edgar Miller and his colleagues studied many cases of vitamin E and health.

C.Dr.Edgar Miller advises that people should not depend on vitamin E supplements for longer and healthier lives.

D.People who took 200 international units of vitamin E a day or more died at a higher rate than people who did not take supplements.

答案

小题1:B

小题2:C

小题3:D

小题4:A

小题1:根据第一段的“Vitamin E supplements,which millions take in the hope of longer, healtheir lives, may do more harm than good”可以得知答案。

小题2:以最后一段的“We don’t think that people need to take vitamin E supplements, which they can get enough from the diet”作为依据可以推出C项不正确,所以答案是C项。

小题3:从最后一段的“Nuts, oils, whole grains and green leafy vegetables are all rich in vitamin E”中可以找到答案,前三项都有提及,因此答案是D项。

小题4:文章内容是围绕一项研究人们服用维E补充品的结果展开的,而且研究表明人们服用过多会减短他们的寿命。综合四项只有A项最全面最完整,因此答案为A项。

阅读理解与欣赏

微循环——生命之网

       微循环是指微动脉和微静脉之间的血流循环。

       人的心脏好比水泵—样。人体内大大小小的血管如同大江大河,毛细血管如同小支流和渠道,人体的组织和细胞如同水田里的秧苗。细胞所需要的营养物质靠“大江大河”“小支流”和“渠道”运送,“小支流”和“渠道”的来回运送过程就称为人体的微循环。 

       微循环为物质代谢提供交换场所,使血液同细胞进行直接的物质交换。微血管是真正的营养血管,直接为营养细胞服务。人体血管中,微循环血管最细、管壁最薄、血流最慢,只有它才能让氧和二氧化碳通过,才能让葡萄糖和氨基酸通过,才能让水、盐及其他营养物质通过。

       微循环是维系人体生命的循环。整个循环系统的工作,如心脏的跳动、血液的流动、神经系统、内分泌系统的调节,只不过是为了创造适宜的环境和条件,使毛细血管按照人体的需要活动,发挥它供应营养和氧的机能,保证全身组织细胞新陈代谢的正常进行,从而维护人体活动的生命机能,因为物质的新陈代谢活动,才是生命最本质的活动。

       微血管的数量是非常惊人的。有人曾在1平方毫米的肌肉切片上,数出了1350条微血管。有人估计,全身约有300亿根微血管;将全部血管连接起来,总长度大约有11万公里,比长江长18倍,可环绕地球赤道2圈半。

1.下面是给“微循环”所下的定义,表达准确的一项是 [ ]

A.微循环是指微动脉和微静脉之间的血液循环。

B.人体血管中的毛细血管来回运送细胞所需要的营养物质的过程就是微循环。

C.微循环是为血液同细胞进行直接物质交换服务的营养血管。

D.微循环是维护人体生命机能的循环。

2.下面是对微循环的基本职能的表述,不够准确的一项是  [ ]

A.微循环为物质代谢提供交换场所。

B.微循环使血液同细胞进行直接的物质交换。

C.微血管是真正的营养血管,直接为营养细胞服务。

D.微循环血管最细、最薄、血流最慢,因而可使各种营养物质通过。

单项选择题