下列生物学家中持有该图所体现的观点的是 ①亚里士多德　②达尔文　③赫胥黎　④伽

经3天疗法治疗失败的尿路感染，治疗宜（）。

A.抗菌药联合治疗

B.口服有效抗菌药物7天

C.长疗程低剂量抑菌疗法

D.静脉输注抗菌药物

E.口服有效抗菌药物14天疗程

C

Depression （抑郁症）is a serious problem today. Depression causes workers to be unproductive, causing companies and countries to lose billion of dollars. One expert says that depression is like cancer because it is “widespread, costly and deadly”. Depression hits one person in five around the world.

Although people have believed depression to be a problem among the rich and educated, studies show that depression is a problem among everyone. Over any six-mouth period, between five to seven percent of the world’s population will be suffering from a serious depression.

Suicide （自杀）rates among people suffering from the disease in its extreme, or clinical form were 80 percent higher that in the population at large, and suffers were four times more likely to have heart attacks. People who suffer from depression often have problems sleeping, getting up on time, and doing work productively.

Depression, which researchers agree has its origin in the genes（基因）, brings loss of of confidence and ability to concentrate-making it possible for employees and managers to work efficiently.

Depression is made more serious in China by Chinese’s by Chinese inability to face it. Many people believe that depressed people are either weak or lazy. Besides, there is no good treatment, with few specialists available.

“Most patients in China just don’t get help,” a Chinese doctor says. “In my hospital, I have to see 30 or 40 patients in a morning, and just have time to say ‘Hello, how do you feel?’”

In Western countries, people are not afraid to admit that they have depression, but most do not tell it to their boss, because they fear that their boss would fire them.

“In my experience, aging bosses are the most tilling to admit they have it, because they feel the most secure about themselves,” an American doctor says.

Hopefully, in the near future, people around the world will be able to admit that they have depression so that they can get the right treatment.

49．Which of the following is TRUE according to the passage?

A．It is widely believed that everyone may suffer from depression.

B．Depression brings great problems to its suffers in their life and work.

C．Depression is a commonly-existing problem only in rich countries.

D．The poorer and the less educated a person is, the less he will suffer from depression.

50．Compared to normal people, depressed people are likely to be__________.

A．very unconfident and often absent-minded   

B．easy to avoid being hit by heart attacks

C．working efficiently and productively

D．either weak or lazy

51．Depression becomes more serious in China because of _________.

A．the understanding of the problem   B．the lack for treatment and doctors

C．their unwillingness to tell it to their boss       D．the doctors’ careless work

52．What can we infer from the passage?

A．People are suffering from depression because of the shortage of specialists.

B．The aging bosses around the world dare to say they are depressed.

C．More and more patients will turn to specialists for help.

D．Western people are braver than Chinese people.

黄瓜霜霉病病菌侵染的必要条件是（）。

A.叶面结露或有水膜

B.空气相对湿度70%以下

C.气温30℃以上

D.瓜秧长势衰弱

阅读《光的折射》的教学实录片段，回答问题。（上课伊始，教师放映山东电视台拍摄的《海市蜃楼》片段）师：目睹了“海市蜃楼”的奇观之后，同学们有何感想？生1：大自然太奇妙了！生2：海市蜃楼真美，真壮观！生3：海市蜃楼是怎样产生的？它为什么那样神奇、美丽？师：同学们也许还会提出许许多多这样或那样的问题，能提出问题是好事。下面我们一起来寻找这些问题的答案。先来研究一个简单的例子，我把筷子斜插入水中，大家观察到什么现象？直接看筷子和通过水看筷子是否一样？（教师演示筷子斜插入水中的实验，学生观察并回答问题。）师：大家观察得很仔细，回答得也很好。那么请同学们猜想一下，造成这些现象的原因可能是什么？生：可能是光由水进入空气中发生了偏折。师：这位同学的猜想到底对不对？用什么来检验？生：用实验！师：对！用什么样的实验呢？请同学们设计一下。生：让一束光斜射入水中，观察光的传播方向。为了便于观察，还应当用透明的器皿来装水。师：非常好！同学们的设计思想正好和老师一致，在你们的桌上，已经摆放着老师为你们准备好的光学仪器盒，老师先把实验装置介绍一下，然后同学们就可以动手做实验了。（教师介绍实验装置后，学生动手实验。）师：通过实验，同学们得出什么结论？生1：光从空气中斜射入水中，传播方向发生改变。生2：光从一种介质进入另一种介质，传播方向发生改变。师：回答得很好！光从一种介质斜射入另一种介质时，传播方向一般会发生改变，这种现象叫作光的折射。这就是我们这节课要学习的内容。师：上节物理课我们学习了光的反射，请同学们回顾一下，光在反射时遵循哪些规律？生：反射光线、入射光线与法线在同一平面内；反射光线和入射光线分居于法线两侧；反射角等于入射角。师：根据刚才的实验，类比于光的反射定律，你能否猜测一下，光是怎样进行折射的？可能遵循哪些规律？生1：折射光线、入射光线和法线在同一平面内。生2：折射光线和入射光线分居于法线两侧。生3：折射角等于入射角。生4：折射角不等于入射角。生5：折射角小于入射角。生6：折射角大于入射角。师：同学们说得都很好，都有一定的道理，那么，光的折射现象是否遵循这样的规律呢？带着这个问题，现在，咱们人人都来当一回科学家，利用桌上的光学仪器盒来研究光在折射中有什么规律。我们还要看一看哪一组发现的现象多，归纳的结论准确而完整。（学生分组实验，教师巡查、指导、答疑，把个别游离于实验小组之外的学生及时“拉”回小组实验，并时而指点操作不正确的学生，时而参与到学生的实验操作之中。大约10分钟后，许多学生画出了光路图，并整理出实验结论，学生实验操作基本完毕。）师：通过实验，同学们得出了哪些结论？（指定一个小组）请你们小组汇报一下。生：我们小组得出的结论是：折射光线、入射光线和法线在同一平面内；折射光线和入射光线分居于法线两侧。师：其他小组是否也得到这两条结论？如果是，请举手。（大多数学生举手。）师：还有其他结论要补充吗？生：有！我们小组还发现，光从一种介质进入另一种介质时，传播方向也可能不发生改变，比如在垂直入射的情况下。师：完全正确。同学们还有其他意见吗？比如说关于折射角和入射角的关系，你们的猜想如何？实验的结果又是如何？生：我原先猜想折射角应当等于入射角，理由是与光的反射定律类比。通过实验发现，折射角一般不等于入射角。师：这说明什么呢？要得出正确的结论，还得通过实验来检验。这位同学就是这么做的，首先，他敢于大胆猜想，然后，他能利用实验来检验这种猜想。这种做法很值得我们学习。（掌声）……问题：（1）结合以上案例，谈谈上述教学案例所采用的教学方法及特点。（2）对该案例进行简要评析。

The loading, unloading, transshipment and transit of inward and outward mail bags are subject to Customs control and a ______ wya bill should be submitted to the Customs by the enterprise providing prviding postal service.

A．cover
B．covering
C．covered
D．haveing covered