疾病分布中出现长期变异的原因是什么

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问题:

疾病分布中出现长期变异的原因是什么

考点:在职联考流行病学基础公共卫生硕士专业学位联考流行病基础
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火车每小时行120[ ]

A.m

B.km

C.cm

D.mm

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某中学生物科技活动兴趣小组,在探究“口腔对淀粉的消化作用”时,进行了以下实验:

请回答下列问题:

(1)为了证明“唾液对馒头有消化作用”,在2号试管的A处应加入                                ,与1号试管起________      作用。

(2)为了证明“牙齿的咀嚼,舌的搅拌”对馒头有消化作用,应选用               两只试管进行对照实验。

(3)实验结果是    ___    号试管中的物质遇到碘液不变蓝,原因是                                                         

(4)有的同学提出“除了以上三个试管外,还要设置第四个试管,放入馒头块与清水不搅拌,其他处理均相同”。你认为第四个试管的设置           (填“有”或“无”)必要。

(5)通过以上实验可知,口腔对淀粉既能进行             消化,又能进行           消化。

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羊水过多的常见胎儿异常是神经管畸形,而羊水过少者则为泌 * * 畸形。

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According to a new study by Israel researchers from University of Haifa, posting blogs to express feelings and emotions is therapeutic for children aged 13-17. Psychology professors Meyran Boniel-Nissim and Azy Barak have found that a teenager writing a publicly-viewed blog on the Internet is more effective for relieving stress rather than keeping a private diary. The study, published in the journal Psychological Services, supports that expressing oneself through writing can be therapeutic.

To conduct the research, Boniel-Nissim and Barak randomly selected Israeli high school students who displayed a certain degree of stress. The teenagers were then divided into six groups. Two groups were asked to post blogs twice a week about their social difficulties, but only one of them was asked to open the blogs for comments. The next set of groups were also asked to blog twice a week to post about whatever was going on in their mind, again with one group allowing comments. The two control groups were asked to keep an old-fashioned private diary.

The researchers then collected the blog posts and diaries to discuss the adolescents’ emotional and social position. From the research, they saw that the greatest improvement in mood was with the bloggers who wrote about their personal troubles and allowed people to interact with their posts. The research also noted that the comments were mostly positive and constructive. Boniel-Nissim and Barak said that the commentators’ interactions helped the bloggers while they were distressed. The conclusive research noted that expressing yourself on the Internet not only let others know what was personally going on with you, but also helped you figure out some things about yourself too.

小题1:The underlined word “therapeutic” in Paragraph 1 can be best explained as “     ”.

A.attractive to teens

B.addictive for children

C.making people feel calm and relaxed

D.able to be easily hurt小题2:______________were selected for the research.

A.Those who blogged regularly.

B.Those who suffered from stress.

C.Those who had never blogged before.

D.Those who had poor social skills.小题3:The research shows that teens benefit most when       .

A.they blog and allow comments

B.they discuss their study on the blog

C.they keep a traditional diary

D.they comment on someone else’s blog小题4:We can infer from the last paragraph that blogging ___________.

A.should not always be opened to comments

B.is most useful in improving one’s mood

C.is not an effective way to express one’s feelings

D.can help students see their problems better

题型:问答题

为了在程序运行时,当被遮住的窗口又重现时,用该窗体的Picture属性设置的背景图像会自动重画,设置值为True的属性是______。

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