问题 单项选择题

原发性低血压是人类的一种遗传病,为研究其发病率和遗传方式,正确方法是()

①在人群中随机抽样调查并计算发病率

②在人群中随机抽样调查研究遗传方式

③在患者家系中调查并计算发病率

④在患者家系中调查研究遗传方式

A.①②

B.②③

C.③④

D.①④

答案

参考答案:D

解析:

对遗传病进行调查时,最好选取群体中发病率相对较高的单基因遗传病。若调查的是遗传病的发病率,则应在人群体抽样调查,选取的样本要足够的多,且要随机取样,最后计算发病率;若调查的是遗传病的遗传方式,则应以患者家庭为单位进行调查,然后画出系谱图,再判断遗传方式。故选D

考点:本题考查人类遗传病的调查实验。

点评:本题意在考查考生的识记能力和实验调查能力,属于容易题。

阅读理解

The H1Nl virus has been spreading world-wide,it is important for us to know how to control it.Please pay attention to the following points:

1.Don't touch your face.Above all,keep your hands away from your eyes,mouth and nose,all of which serve pathways(途径) for the viruses(病毒) to enter your body.

2.Wash your hands.If you have to touch your face,wash your hands,getting under the fingernails for 20 to 30 seconds with hot soap and water before.Soaps with surfactants(表面活性剂) can deal with flu viruses.

3.Cover your nose and mouth.When someone sneezes or coughs,liquid(液体) drops with flu viruses as far as three feet through the air and land on your nose and mouth,so it's best to keep at least an arm's length distance when talking to someone who shows signs of infection(感染).In order to protect others,cover your mouth and nose with a tissue(纸巾) when you cough or sneeze,and clean your hands afterward.Viruses can live for hours,or even longer when on the skin or other surfaces such as keyboards.

4.Consider buying a mask in case you need it in the future.Some research suggests that masks reduce the risk of getting the flu viruses by as much as 80%.But it also suggests that if you don't wash hands,the mask doesn't work well.So wash your hands and use the mask,especially wearing face masks in crowded places is also useful.

根据短文内容,选择最佳答案。

小题1:The article mainly tells ________.

A.the H1N1 virus has been spreading world-wide

B.how to control the H1N1 virus

C.cover your nose and mouth

D.everyone should buy a mask in the future小题2:How does the viruses enter your body easily?

A.Get though your mouth.

B.Get though your nose.

C.Get though your eyes.

D.All of the above.小题3:What can we do with the flu viruses?

A.Water.

B.Masks.

C.Soaps with surfactants.

D.Tissues.小题4:How long can the viruses live on the skin or other surfaces such as keyboards?

A.For an hour.

B.For several hours.

C.For two weeks.

D.For a year.小题5:Which of the statements is Not True?

A.Wash your hands before meals.

B.When you cough or sneeze,you should cover your mouth and nose with a tissue.

C.You shouldn't often touch your mouth,eyes and nose.

D.When you put a mask,you can often go to the crowded places.

单项选择题 A型题