解方程． 4x-3.2=6.4 3x-2.5x=2.4．

如图1所示电路，电阻R₁、R₂、R₃两端的电压分别用U₁、U₂、U₃表示，流过电阻R₁、R₂、R₃的电流分别用I₁、I₂、I₃表示，电压表V₁的示数为4V，电压表V₂的示数为6V，电流表的示数为1A．

（1）请在方框内画出去表后的电路图；

（2）用题目中所给出的各物理量的字母表示出各表的示数．电压表V₁的示数_________；电压表V₂的示数_________；电流表A的示数_________。

（3）将图1中的两块电压表换成电流表，如图2所示，流过电阻R₁、R₂、R₃的电流分别用I'₁、I'₂、I'₃表示，且I'₂=0.5A，电流表A₁的示数为1.5A，电流表A₂的示数为0.8A，电流表A的示数用I'表示。根据电流表的示数及该电路的特点，请计算出流过电阻R₁和R₃的电流I'₁和I'₃分别为多少？电流表A的示数I'是多少？（要求写出计算过程）

下列有关文学常识表述不恰当的一项是[ ]

A．所谓“盛唐气象”是指在这一时期诗歌中蓬勃的气象，这蓬勃不只由于它发展的盛况，更重要的是一种蓬勃的思想感情所形成的时代性格。山水田园诗派的代表人是王维和孟浩然，边塞诗派的代表人是高适和岑参。

B．李白，字太白，号青莲居士，他具有超乎寻常的艺术天才和磅礴雄伟的艺术力量，是屈原之后我国最杰出的浪漫主义诗人，有“诗仙”之称。杜甫赞美他“笔落惊风雨，诗成泣鬼神”。

C．杜甫是盛唐诗坛另一颗耀眼的巨星。字子美，自称少陵野老。其诗显示出唐代由盛转衰的历史过程，善于反映社会状况，表达了人民的愿望，被称为“诗史”。韵律完美、沉郁顿挫是其独特的风格。

D．苏轼、辛弃疾是宋词豪放派的代表人物，尤其后者是宋词创作中取得最高成就的作家。李清照词以靖康之难为界，前期清新自然，属婉约派；后期沉痛哀伤，趋于豪放风格。

这几年北京的老人都能感到，北京城变绿了，变美了。

50多年前的北京城，除了护城河两岸的居民的院子里有点树以外，其他地方根本没有多少树。那时候的北京一刮大风，风沙使人睁不开眼睛。新中国成立以后，政府把绿化首都作为一项重要任务。经过50多年的努力，北京城变了样。过去光秃秃的北京城，现在有3200多处街心花园和绿地。从首都机场到石景山的百里长街两侧，从北京通往外地的5条公路两旁，形成了一条条绿色长廊。北京，变成了一个美丽的城市。

真正的好文章，一定要鲜明而有力地拥护那些应当拥护的东西，同时也一定要鲜明而有力地反对那些应当反对的东西。这才会是生气勃勃的好文章。

这段话直接支持了这样一种观点，即（）

A．真正的好文章有两条衡量标准

B．真正的好文章应爱憎分明

C．写好文章的人应该知道每件事的好坏标准

D．真正的好文章应有鲜明而正确的观点

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

简述用炉渣观察、判断炉缸温度。