菜单控件只包含一个事件，即（）时间，当用鼠标单击或键盘选中后按"回车"键时触发该事件

用洋葱鳞片叶表皮制备“观察细胞质壁分离实验”的临时装片，观察细胞的变化。下列有关实验操作和结果的叙述，正确的是[ ]

A．将装片在酒精灯上加热后，再观察细胞质壁分离现象

B．在盖玻片一侧滴入清水，细胞吸水膨胀但不会破裂

C．用不同浓度的硝酸钾溶液处理细胞后，均能观察到质壁分离复原现象

D．当质壁分离不能复原时，细胞仍具正常生理功能

黄芪与茯苓配伍，茯苓能增强黄芪的补气利水作用，这种配伍关系是（）。

A.相须

B.相使

C.相反

D.相恶

E.相畏

有机物A是常用的食用油抗氧化剂，分子式为C₁₀H₁₂O₅，可发生如下转化：已知B的相对分子质量为60，分子中只含一个甲基。C的结构可表示为 （其中-X、-Y均为官能团）。

请回答下列问题：

(1)根据系统命名法，B的名称为___________。

(2)官能团-X的名称为____________，高聚物E的链节为________。

(3)A的结构简式为____________。

(4)反应⑤的化学方程式为____________________。

(5)C有多种同分异构体，写出其中2种符合下列要求的同分异构体的结构简式：________________。

a．含有苯环 b．能发生银镜反应 c．不能发生水解反应

一些常见食物的近似pH范围如表：

食物	橘子汁	泡菜	牛奶	鸡蛋清
近似pH范围	3.0-4.0	3.2-3.6	6.3-6.6	7.6-8.0

则下列说法错误的是（　　）

A．鸡蛋清显碱性

B．胃酸过多的人应少吃泡菜

C．牛奶比鸡蛋清的碱性强

D．橘子汁不能使无色酚酞试液变红

A new study has been carried to test the role of story telling in lowering blood pressure．Dr．Thomas Houston, a professor of the University of Massachusetts Medical School, led a group of scientists that investigated how pre-recorded videos of hypertension （高血压） patients' talking about their medical histories helped another group of patients with high blood pressure to control their condition over several months．

Houston was surprised by their studies that suggested that communication can be a powerful tool in medicine．They showed that those who had had similar experiences, when talking to someone with a similar background, could help change their behavior to become healthier．Hypertension is difficult to control, since it is dependent on diet, exercise and mental state．Medical treatments with drugs, and lifestyle therapies（疗法） have been relatively ineffective because people find it hard to follow those medical requirements．

In the test, his team carefully chose their story-tellers from 230 members of a patients' community with whom they could most easily relate．Next, they divided their study population into two groups．One received three interactive （互动） DVDs containing the tellers' stories of their experiences in living with and treating their hypertension．The other were given educational discs on an unrelated health topic．The study volunteers reported that they had listened to the DVDs, and after three months, those who heard the stories of the hypertensive patients lowered their blood pressure．

While the study did not address how the story-telling influenced the patients' behavior, Houston suspects that watching patients of similar backgrounds who had a similar medical experience helped to motivate them to seek medical help to their hypertension．They found that after six months the difference in blood pressure between those who watched the story-tellers and those who observed the unrelated videos remained, suggesting that the story-telling continued to have an effect．

小题1:We can learn from the text that the pre-recorded videos _________．

A．tell medical histories of hypertension patients

B．introduce some medical treatments of hypertension

C．introduce a good lifestyle for hypertensive patients

D．tell scientific discoveries of the scientist group小题2:Houston was surprised to find that _______．

A．hypertension is really difficult to control

B．communication has some medical effects

C．medical treatments have no effect at all

D．people don't follow the medical requirements小题3:Which of the following is true about the study?

A．The scientists chose 230 patients from a hospital．

B．Both the groups used the same videos about health topic．

C．The two groups lowered blood pressure in different degrees．

D．The story-tellers were hypertension patients as well．小题4:Which of the following could be the best title of the text?

A．The stories of some hypertension patients．

B．Medical treatments of blood pressure．

C．Storytelling may help lower blood pressure．

D．Suggestions about how to lower blood pressure．