1787年宪法具有一定的民主性，下列内容最能体现其民主性的是 [ ] A．总统和

呼吸兴奋剂在呼吸衰竭治疗的适应证是（）

A.中枢抑制为主、通气量不足

B.呼吸道分泌物积滞

C.呼吸道通畅

D.肺水肿

E.呼吸肌功能正常

常用来计量基础代谢率平均值的单位是（）

A.kJ/L

B.kJ/（m²·h）

C.kJ

D.%

E.L/g

It is one of the greatest mysteries of nature. In case you haven’t noticed, all living things follow very definite, individual rhythms, all as regular as a clock, but what makes them regular?

Though many scientists maintain that these rhythms are the result of some outside force like gravity or radiation or both, the results of most scientific researches agree with other scientists who believe that each living thing has its own built-in biological “time clock.”

Take the mystery of migration for example. Scientists can’t really explain why many species of birds migrate in the autumn even though the temperature is still summery. The birds just seem to snub the comfortable weather that they are having. When a certain time comes, they travel south by the thousand. In spring time, they migrate northwards even though there probably is snow still covering the ground when they finally arrive. Something said “go,” and they did.

Animals that hibernate (冬眠) are obeying individual time clocks, too. When their clock indicates the time to take a winter’s nap, they do, and nothing can stop them. At a certain time in the spring, they wake up and come out regardless of the weather outside.

Plants appear to have yearly rhythms, such as the sprouting of seeds, and they also have daily rhythms. Notice sometimes that plants raise their leaves in daylight and lower them at night.

If you live along the California coast, you can easily observe a demonstration of this mysterious clock functioning regularly. There, from February to September, the highest tides occur exactly every fourteen and four-fifths days, and during these high tides, but at no other time, small silvery fish called grunions surf-ride a wave to the beach. There the female deposits her eggs in the sand and the male fertilizes them; then both hitch a wave-ride back to the sea. Exactly fourteen and four-fifths days later, never before or after, the tiny eggs hatch, and the high tide carries the new babies out to sea.

72. According to the passage, the mysterious rhythms result from ______.

A. the influence of gravity on living species

B. the effect of radiation on living species

C. the influence of a mysterious outer force on living species

D. the internal mechanism inside the living species

73. The underlined word “snub” in the third paragraph probably means ______.

A. fight   B. ignore C. symbolize   D. criticize

74. Which of the following statements is NOT TRUE?

A. Hibernating animals are obeying an internal time clock.

B. The positioning of the leaves of some plants is due to the daily rhythms.

C. The internal clock functioning is demonstrated in the reproducing habits of grunions. 

D. The yearly hibernation is more because of the weather influence than the biological functioning.

75. The passage is mainly about ______.

A. the rhythms of life  

B. the reasons of mysterious hibernation

C. strange behaviors of species     

D. the timing for different events in the world of species

有一个学生选课的关系，其中学生的关系模式为：学生(学号，姓名，班级，年龄)，课程的关系模式为：课程(课号，课程名，学时)，其中两个关系模式的键分别是学号和课号，则关系模式选课可定义为：选课(学号，______，成绩)。

物质文化、技术文化的传播，其意义不仅仅局限于物质的和技术的领域，它们还可能影响人们的精神世界和生活方式．甚至产生意料之外的效果。因为这些物质产品和技术发明，还体现了创造者、发明者的精神理念、审美情趣和价值追求，体现了他们作为某一文化共同体成员所接受的文化传统的濡染和教育。而物质文化和技术文化的输出，间接地传达了这种物质产品所包含的精神内容和文化内涵，因而也就使其成为文化整体的代表而传播并发生影响。 这段文字的主旨是( )。

A．物质产品的文化内涵来自于文化传统

B．物质文化与技术文化也能影响人们的精神文化

C．不同文化中共有的文化传统促进了物质文化的传播

D．物质文化与技术文化是在与不同文化的碰撞中发展的