当摘除了一朵花中的哪一部分后，这朵花就再也不会发育成果实[ ] A．雄蕊 B．雌

如图为心脏结构示意图，请据图回答：

（1）心脏主要由　  　组织构成．（选填“肌肉”或“结缔”）

（2）观察心脏的四个腔，可以看到　    　的壁最厚，这与它的功能是相适应的．

（3）从肺静脉注水，水将会从主动脉流出，而从主动脉注水，则水注不进去，这是由于心房与心室之间、心室与动脉之间有　  　，他们只能单方向开放，保证了血液的流动有一定方向．

（4）血液由右心室射出，最后由肺静脉流回左心房的血液循环途径是　   　．（选填“体循环”或“肺循环”）

将我国古代部落联盟首领的名字分别填在下列相应的横线上。  

（1）领导人民治理洪水，三过家门而不入的是________。  

（2）与黄帝部落结成联盟，打败蚩尤部落的是________。  

（3）出身贫苦，非常孝顺的是______________________。  

（4）勤俭朴素，办事公正的是______________________。

  Just five minutes of exercise a day outdoors can improve mental health, according to a study.

Researchers from the University of Essex, UK have found that as little as five minutes of a “green activity” such as walking, gardening, cycling or farming could help to improve mood and increase self-esteem (自信).

Many studies have shown that outdoor exercise can reduce the risk of mental illness and improve a sense of well-being, but the new study, led by Jules Pretty and Jo Barton, was the first to determine how much time needed to be spent on green exercise for the benefits to show.

Barton and Pretty looked at data from 1,252 people of different ages, genders (性别) and mental health status (情况) taken from 10 studies in Britain.

They analyzed their different outdoor activities including walking, gardening, cycling, fishing, boating, horse-riding and farming in locations such as a park, garden or nature trail (路径).

They found that the mental health changes were seen after just five minutes. With longer periods of time exercising in a green environment, the positive effects were more apparent.

Looking at men and women of different ages, the researchers found the health changes were particularly strong in the young and the mentally ill.

Green and blue

A bigger effect was seen with exercise in an area that also contained water – such as a lake or river.

“This is because historically we are drawn to water to survive and it is in our genetic (遗传的) make-up to be at one with nature,” the researchers wrote in their report.

Pretty said those who were generally inactive, or stressed, or with mental illness would probably benefit the most from “green exercise”.

“Employers, for example, could encourage staff in stressful workplaces to take a short walk at lunchtime in the nearest park to improve mental health.”

He also said exercise programs outdoors could benefit youth offenders.

小题1:How is the study this article refers to different from other studies?

A．It involved more people.

B．It took longer to finish the research.

C．It determined the exact amount of time needed.

D．It was led by just two researchers.小题2: What can we conclude from the findings of the study?

A．Just five minutes of “green exercise” daily can help improve mental health.

B．Gardeners and farmers do not need “green exercise”.

C．Walking in a park with a lake will weaken the effect.

D．“Green exercise” is not suitable for the mentally ill.小题3:. According to Pretty, _______ would probably benefit the most from “green exercise”.

A．stressed, inactive people

B．office workers

C．youth offenders

D．women and children小题4: What is the main problem discussed in this article?

A．Physical well-being.

B．Outdoor exercise.

C．Mental illness.

D．Harmony with nature.

下列哪项不是脉络膜黑色素瘤的CDFI特征

A．睫状后动脉供血
B．高速高阻血流信号
C．丰富分支
D．中速低阻血流信号
E．中高收缩期和较高舒张期的动脉血流

计算机控制系统由（）和（）两大部分组成。