按规定，对载重量为（）总吨及以上的油船，必须设有惰性气体保护系统。A、500 B、1

Most schools forbid chewing gum(嚼口香糖), but in a few years they might consider changing that rule. Why? Scientists are finding evidence that gum chewing may be good for your health. It may even help improve your test scores. This exciting research is just beginning. And in the meantime, companies are also experimenting with adding vitamins, minerals, medicines, and other substances that could give gum the power to cure headaches and fight everything from serious diseases to bad breath.

Other researchers are finding that gum might work better than a pill to deliver medicines and other substances into the bloodstream. That’s because the lining (膜) of our cheeks can absorb certain substances more quickly than our stomachs and intestines (肠) can. That discovery could help other researchers develop medicine-containing gums that fight colds, ease headaches, battle nervousness, and

more. Scientists might even create anti-microbial (抗菌的) gums that cure bad breath.

Those projects may take years, but gum scientists have already had at least one recent success: They’ve created a gum that could help us stay awake. Researchers have produced a gum called Stay Alert. Each stick has as much caffeine as a cup of coffee. It can take an hour for the caffeine in coffee to have its full effect, but the caffeine in Stay Alert hits in just a few minutes. The gum is easy to transport and it’s stable in cold and hot climates. Unlike a pill, it doesn’t require water to swallow. Those qualities make it easy for soldiers to use. For now, Stay Alert is available only to the military (军队). The manufacturer may one day offer it for sale to the public. People who work at night, such as truck drivers and medical personnel who ride in ambulances, might benefit from a product like Stay Alert.

小题1:The passage mainly talks about _____.

A．the rule of forbidding chewing gum in school

B．new research on chewing gum

C．different kinds of chewing gum

D．the relationship between chewing gum and medicine小题2:What does the underlined word “hits” in Paragraph 6 probably mean?

A．Touches.

B．Attacks.

C．Takes effect.

D．Affects badly.小题3:According to the passage, Stay Alert is a gum which can help people _____.

A．stay awake

B．fight colds

C．cure headaches

D．overcome nervousness小题4:It can be inferred from the passage that _____.

A．stay Alert is not easy to store

B．stay Alert needs water to swallow

C．stay Alert is available to the public now

D．we can’t buy gums which cure bad breath now

在气管内插管条件下开胸侧肺萎陷造成哪些呼吸系统病理生理改变（）

A.肺泡表面活性物质减少

B.肺循环阻力增加

C.肺泡通气面积锐减

D.氧弥散功能障碍

E.低氧血症

38岁女性患者，钡餐示食管壁张力减低，蠕动减弱，钡剂排空延迟，并在食管下段见到串珠状充盈缺损影。首先考虑（）。

A.反流性食管炎

B.食管下段平滑肌瘤

C.食管下段静脉曲张

D.食管癌

E.食管裂孔疝

某地有两个奇怪的村庄，张庄的人在星期一、三、五说谎，李村的人在星期二、四、六说谎。在其他日子他们说实话。一天，外地的王聪明来到这里，见到两个人，分别向他们提出关于日期的问题。两个人都说：“前天是我说谎的日子。”
如果被问的两个人分别来自张庄和李村，以下哪项最可能为真

A．这一天是星期五或星期日。
B．这一天是星期二或星期四。
C．这一天是星期一或星期三。
D．这一天是星期四或星期五。
E．这一天是星期三或星期六。

住院医师培训第一阶段时间为期几年。（）

A.1

B.2

C.3

D.4