题目
题型：不详难度：来源：
Bacteria(细菌) are extremely small living things. While we measure our own sizes in inches or centimeters, bacterial size is measured in micron. One micron is a thousandth of a millimeter; a pinhead is about a millimeter across, Rod-shaped bacteria are usually from two to four microns long, while rounded ones are generally one micron across. Thus, if you magnified a rounded bacterium a thousand times, it would be just the size of a pinhead, while a grown-up human enlarged by the same amount would be over a mile tall.
Even with an ordinary microscope(显微镜), you must look closely to see bacteria. Using a magnification of 100 times, one can hardly find bacteria. Nor can one make out anything of their structure(结构), of course. Only by using special colors, can one see that some bacteria have wavy-looking “hairs” called flagella. Others have only one flagellum. The flagella move round a central point, pushing the bacteria through the water. Many bacteria lack flagella and cannot move about by their own power, while others can move along over surface by some little-understood “machinery”.
From the bacterial point of view, the world is a very different place from what it is to humans. To a bacterium, water is as thick as molasses(糖浆) is to us. Bacteria are so small that they are affected by the movements of the chemical molecules(分子) around them. Bacteria under microscopes, even those with no flagella, often jump up and down in the water. This is because they knock with the water molecules and are pushed this way and that.
36. The underlined word magnified means _______________.
A. enlarged B. widened
C. killed D. caught
37. We know from the passage that _______________ is the smallest.
A. a pinhead B. a rounded bacterium
C. a microscope D. a rod-shaped bacterium
38. The relationship between a bacterium and its flagella is most nearly like which of the following?
A. A rider jumping on a horse back
B. A ball being hit by a bet
C. A boat powered by a motor
D. A door closed by wind
39. Why does the writer compares water to molasses in the third paragraph?
A. To tell us how difficult it is for bacteria to move through water.
B. To suggest that bacteria are fond of different liquids.
C. To show different chemicals are of different structures.
D. To show that bacteria are the best swimmers.
40. Which of the following is the main topic of the passage?
A. The characteristic (特点) of bacteria.
B. How bacteria reproduce.
C. The various parts of a bacterium’s body
D. How bacteria cause diseases.
答案
小题1:A
小题2:B
小题3:C
小题4:A
小题5:A
解析
核心考点
试题【 Bacteria(细菌) are extremely small living things. While we measure our own sizes 】；主要考察你对题材分类等知识点的理解。[详细]
举一反三
第一部分 完形填空（共20小题；每小题2分，满分40分）
完形填空（1） 阅读下面短文，掌握其大意，然后从1~10各题所给的A、B、C和D项中，选出最佳选项，并在答题卷上将该项涂黑。
A bar manager was so sure that he himself was the strongest man around 1 he offered a standing $ 1,000 bet that no one could beat him.
The 2 was that the landlord would squeeze a lemon until all the 3 ran out into a beer glass, then hand the lemon to the customer. Anyone who could squeeze even one more 4 out of the lemon would win the money.
0ver the years many people had tried this, truck drivers, weightlifters, karate masters, and 5 had failed. Then one day a little fellow with heavy black rimmed glasses came into the bar and asked if he 6 try the challenge.
After the laughter had quieted down, the landlord said that it was only 7 that the man be given a chance at the bet, so he picked up a lemon and started squeezing. 8 he had done he handed the 9 to the little man who promptly squeezed out 4 more drops of juice onto the bar!
Everyone looked on in amazement as the landlord handed over the prize and asked “What do you do 10 a living that has given you such strength? Are you a lumberjack, weightlifter?” “No.” the man replied, “I work for the IRS（国税局）.”
1. A. that B. there C. therefore D. since
2. A. fact B. trap C. challenge D. match
3. A. flesh B. juice C. seeds D. peel
4. A. water B. lemon C. beer glass D. drop
5. A. none B. neither C. either D. all
6. A. / B. could C. had to D. ought to
7. A. then B. likely C. fair D. chance
8. A. Once B. Right C. Immediately D. In case
9. A. container B. money C. remains D. other
10. A. with B. for C. on D. in
About ten men in every hundred suffer from color blindness in some way. Women are luckier; only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman!
There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shadows of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green －a strange world indeed.
Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called “cones”. These help us to see in a bright light and to tell difference between colors. There are also millions of “rods”, but these are used for seeing when it is near dark. They show us shape but no color.
Some insects have favorite colors. Mosquitoes prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.
1. The passage is mainly about _____________.
A. color and its surprising effects. B. women being luckier than men
C. danger caused by color blindness D. color blindness
2. According to the passage, with the help of the “cones”, we can_______________.
A. tell different shapes B. see in a weak light
C. kill mosquitoes D. tell orange from yellow
3. Why do some people say it is safer to be driven by women?
A. Women are more careful. B. There are fewer color-blind women
C. Women are fonder of driving than men. D. Women are weaker but quicker in thinking.
4. Which of the statements about the color- blind is true?
A. Not all of them have the same problem in recognizing color.
B. None of them can see deep red.
C. None of them can tell the difference between blue and green.
D. All of them see everything in shades of green.
5. We can attract and kill mosquitoes by using a _____________.
A. red light B. yellow light C. blue light D. green light
Healthy Habits, Healthy Body
Feel tired lately? Has a doctor said he can’t find anything wrong with you? Perhaps he sent you to a hospital, but all the advanced equipment there shows that there is nothing wrong with you．
Then, consider this：you might be in a state of sub-health(亚健康)．
Sub-health, also called the third state or gray state, is explained as a borderline state between health and disease．
According to the investigation by the National Health Organization, over 45 percent of sub-healthy people are middle-aged or elderly．The percentage is even higher among people who work in management positions as well as students around exam-week．
Symptoms(征兆)include a lack of energy, depression(压抑),slow reactions, insomnia(失眠),agitation, and poor memory．Other symptoms include shortness of breath, sweating and aching in the waist and legs．
The key to preventing and recovering from sub-health, according to some medical experts, is to form good living habits, alternate work and rest, exercise regularly, and take part in open air activities．
As for meals, people are advised to eat less salt and sugar．They should also eat more fresh vegetables, fruits, fish because they are rich in nutritional elements…vitamins and trace elements …vitamins and trace elements…that are important to the body．
Nutrition(营养)experts point out that it is not good to eat too much at one meal because it may cause unhealthy changes in the digestive tract(消化系统)．They also say that a balanced diet is very helpful in avoiding sub-health．
63．According to this passage, which of the following is right?
A．When you are in a state of sub-health, you should stay home and keep silent．
B．When you are in a state of sub-health, you should go to see a doctor and buy some medicine．
C．When you are in a state of sub-health, you should have yourself examined in foreign countries．
D．When you are in a state of sub-health, you should find out the reasons and relax yourself．
64．Middle-aged people may be easy to get sub-health because ___.
A．they have used up their energy
B．they have lost their living hopes
C．they have more pressure in life and work
D．they begin to get older
65．The key to preventing you from falling into a state of sub-health is that you should ___.
A．work hard B．sleep more
C．form good living habits D．take more medicine
66．As for food, experts suggested that ___.
A．we should never eat meat B．we should have variety of food
C．we should eat less than usual D．we should have meals without salt to sugar
67．The bold-faced word “alternate” in this passage is closest in meaning to ___.
A．arrange by turns B．cause to take place
C．keep up D．take up
B
Over 2,000 years, the examination of the pulse has been a mysterious skill in Traditional Chinese Medicine. Although many westerners may have known something about methods like inspecting, listening and enquiring, pulse reading as a tool to determine physical condition is not common knowledge. It is therefore worth our effort to take a closer look at it.
There are three positions on each wrist which are used for analysis: the front, middle and back part, and analyzed at three different levels: superficial, middle and deep.
On the left wrist, the front position focuses on the condition of the heart and small intestine (小肠), the middle position concentrates on the functions of the liver and gall bladder, and the back position is connected with the kidney. The lungs and large intestine are the centre of attention in the front position on the right wrist, with the middle position focusing on the spleen and stomach and the back taking note of the “Gate of Vitality Fire’. This is the heat provider for all bodily functions.
In regards to the various levels, the superficial level reflects the state of energy, the middle level shows the state of blood flow, and the deep level is an indication of the state of the Yin organs. Suppose that the pulse in the left middle position was soft and smooth, neither superficial nor deep, it would suggest that the liver and gall bladder are in a good state of health.
Checking the pulse is actually far more complex. Doctors need to be able to recognize 26 different pulse categories. For example, a scattered pulse which is irregular and hardly noticeable, is a sign that a patient is critically ill and nearing death. Other categories include the rapid pulse, probably a sign of a fever; or the tense pulse, which may suggest that the patient is suffering from pain. Many pulses only have subtle differences; thus, pulse examination is often seen as being more than just a skill but an actual art form.
This kind of medical diagnosis can be affected by many factors, so before any examination, it is important that patients are in a relaxed physical and mental state so they can get the most accurate reading. The morning is often the best time to take such a reading, as a busy day in the office or vigorous exercise before seeing the doctor can influence the quality of the pulse. The right amount of pressure must be applied by the doctor for the right duration of time. Patients’ characteristics are also of importance. Children, for instance, have quick pulses and athletes have slower than usual ones. Even seasonal influences need to be taken into account.
59. Which of the following is the most suitable title for this passage?
A. Chinese Pulse Checking B. Difficulties in Pulse Checking
C. What Makes a Good Doctor D. Brief Introduction to Traditional Chinese Medicine
60. Which factor is NOT mentioned as possibly influencing the accuracy of a pulse reading?
A. Amount of force used. B. Time of day.
C. Climate. D. Body height.
61. From the passage we can infer that the writer believes __________.
A. Chinese medicine is too difficult to learn
B. pulse reading requires a long-time study and practice
C. doctors need to be familiar with Chinese history
D. pulse examination is unimportant and no longer necessary
The food we eat seems to have profound effects on our health. Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is not a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats, and other food additives, caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives, which we eat, are not all so direct. Farmers often give penicillin to beef and living animals, and because of this, penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration (FDA) has tried repeatedly to control these procedures, the practices continue.
61. What is the best possible title of the passage?
A. Drug and Food B. Cancer and Health C. Food and Health D. Health and Drug
62. Which of the following statements is NOT true?
A. Drugs are always given to animals for medical reasons
B. Some of the additives in our food are added to the food itself and some are given to the living animals
C. Researchers have known about the potential dangers of additives for over thirty---- five years.
D. Food may cause forty percent of cancer in world.
63. How has science done something harmful to mankind?
A. Because of science, diseases caused by polluted food have been virtually eliminated.
B. It has caused a lack of information concerning the value of food.
C. Because of the application of science, some potentially harmful substances have been added to food.
D. The scientists have preserved the color of meats, but not of vegetables.
64. What are nitrates used for?
A. They preserve flavor in packaged food. B. They preserve the color of meats
C. They are the objects of research. D. They cause the animals to become fatter.
65. The word “carcinogenic” most nearly means _________________
A. trouble–making B. color– retaining C. money –making D. cancer–causing
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